Don’t start from scratch.The Winter Block · Founding price ends 30 SeptemberSee how $25 works

Jasper: 24 minutes faster at a favourite gran fondo

Athlete case studyRace and event resultsDurabilityMasters cyclistsFitness and power

Jasper supports the event-specific side of SEMIPRO: the value is not just better test numbers, but being more durable when race day gets messy.

Cut 24 minutes from a favourite gran fondo

Video thumbnail for How This Cyclist Cut 24 Minutes Off His Favourite Gran Fondo.
Source video included

Result at a glance

Main outcome
24-minute event personal best
Timeframe
Not stated
Rider context
Cyclist in his 50s preparing for a gran fondo
Product used
Coaching
Gran fondo preparationRepeat-event benchmarkEvent-specific performance changePractical outcome rather than only lab-style testing

Where this rider actually started.

Started riding in 2021 with a critical power under 200 W, riding raw miles with no plan — as he puts it, either way too hard or way too soft.

Coaching began in early 2024 at around 238 W, reaching 286 W that year before a break.

The 2025 build started again from 261 W.

Goal. Take 20 minutes off the previous year’s time, set a personal best on Palomar Mountain, and halve the gap to the age-group winner.

Main constraint. Started cycling in 2021, came back after a break in training, and had to build for a long mountainous event rather than for test numbers.

The decisions behind the result.

  • Weeks 1–3: a threshold foundation block mixing over-unders with steady-state threshold. Durability elements entered in week 3 as efforts under fatigue plus one big aerobic day.
  • Week 4: reload, with volume and intensity both cut in half.
  • Weeks 5–6: a short taper into a nine-hour ride to test mental resilience, then maintained intensity and testing to set up the next block.
  • Weeks 7–9: a full VO2max block built mostly on short efforts, while the durability work progressed through cadence work at fatigue and tempo at the end of rides.
  • Week 10: rest week, with a VO2max fartlek left open to the rider.
  • Weeks 11–13: peak and taper. Race-specific mixed efforts stacked to match what the event would actually demand, with volume cut and short intensity held.

What was actually measured.

Grouped by what kind of evidence each number is. A race result, a recorded power file, a model estimate and a rider’s own impression do not carry the same weight.

Race or event result

Giro di San Diego
Finished in 5:25, 24 minutes faster than the previous year. Gap to the age-group winner halved. Personal bests on the major climbs, including 4.5 minutes faster up Palomar Mountain.

Recorded or tested power

Durability under fatigue
5-minute power after about 1,500 kJ rose from 231 W in 2023 to 274 W in 2025, roughly 20% higher at the same fatigue level.
Late-race decay, same event two years apart
At 2,750 kJ, power decay fell from nearly 30% to 15%. Cadence drop went from 6 rpm to 3 rpm and heart-rate drift from 11% to 4%.

Modelled power

Critical power
261 W to 298 W across the build, with the new value validated at the event.

Subjective feedback

How the day actually went
He paced too high early, crashed on a gardening pot, cut his thumb so he could not open his gels, climbed Palomar without carbs, cramped, and nearly stopped at mile 47. The personal best was set on a bad day, not a good one.

The useful takeaway.

  • Supports SEMIPRO for gran fondo riders with concrete event goals.
  • Gives readers a direct source for performance improvement in a real event context.
  • Connects the durability claim to a long-event outcome.
  • Supports the specific claim that durability shows up as a smaller decay in power, torque, cadence and heart-rate drift late in a long event.

What this example does not prove.

  • The 24 minutes compares two runnings of the same event a year apart. Weather, road conditions, group dynamics and race-day circumstances all differ.
  • The durability comparison is between rides in different years under different conditions, not a controlled repeat test.
  • Jasper had a coaching history before this build, so the result is not the effect of one 13-week block in isolation.
  • Critical power is a model estimate, not a laboratory measurement.
  • Individual result, no control group.
  • No verified start-to-finish timeframe is published for this record yet.

Where this comes from.

Source video with full transcript, including athlete interview

How This Cyclist Cut 24 Minutes Off His Favourite Gran Fondo

Full transcript
Meet Jasper. I helped Jasper to refocus his training for durability and he cut 24 minutes off his previous grand fondo time. If you want to structure your training so you actually hold race power to the finish without adding extra training time, keep watching. All right, let's talk about Jesper. He's a guy in his 50s who honestly believed his days pushing physical limits were behind him. I think we've all felt that in some way, right? He first jumped onto a bike back in 2021, starting casually figuring things out and easing into it. At the start, his critical power, the watts that he could sustain at the time for 33 minutes, was less than 200 watts. A humble beginning, but a solid first step. Fast forward to early 2024, Jasper decided to level up. Before I got a coach, I was just cycling. Um, pure raw miles, you know, trying to get 5,000 miles a year, but no real plan. And I was probably riding way too hard on most rides or way too soft. And I knew I had to put some structure on it, but I I didn't want to figure it out myself. I wanted just to have a a plan to go hit. When I started coaching Jasper, he was at around 238 watts. Decent, but we knew that there was way more potential to tap into. That year, through structured, targeted sessions, we got him up to 286 watts. A massive improvement for a guy who started riding later on in life. Life threw Jasper a little break as it sometimes does. But in early 2025, he returned more determined than ever with his eyes locked on the Jiro de San Diego, a ride he'd done the year before. Our starting point this time was 261 watts. Over 6 months, we pushed his numbers upward again, reaching a new peak of 298 W. But the most dramatic leap came in those final 90 days, jumping from 279 to 298 watts, edging him close to that coveted 4 watts per kilogram mark. Incredible progress, right? I'm going to cover the training done in the final 90 days in detail in a little bit, but I wanted to start with his race performance. The goal for the race was to carve 20 minutes off his last year's time to smash his personal record on Palomar Mountain, the biggest mountain in the race, and to cut the gap to the age group winner in half. Now, we train by numbers. Watts, hours, intervals, grams of carbs, everything tracked perfectly. They're planned. They're optimized. But sometimes the number one thing that truly defines you is the one thing you never saw coming. But here's the catch. With cycling and life, really, race day rarely goes according to plan. Jasper started the race pacing too high. Adrenaline pulling him towards 260 watts when he should have held back at about 240. Then out of nowhere, a gardening pot in the road. He crashed. Jasper went down, sliced his thumb open. A tiny injury that had huge consequences later on because he couldn't open his gels. So now he's climbing Palomar Mountain, the biggest mountain of the day. And he's holding 250 watts without any carbs in his system. But thanks to his training, he still topped Palomar 4 and a half minutes faster than his best ever time. At the top, he felt dizzy, shaky, thinking, "I'm burning down the house just to stay warm." The next climb, Mesa Grande, came next. It was a hot, steep, and miserable climb. Power dropping to 200 watts, riders passing him by, and he nearly quit. Quitting felt logical. Finishing felt impossible, but somehow he kept turning the pedals, and he hit another personal best. At mile 47, Jasper stops. Legs cramped, blurry vision, utterly spent. Luckily, his mate was there. Gave him some carbs, some caffeine, and some encouragement. And Jasper thinks, "If he doesn't drag me out of here, then I am done." But 40 minutes later, he's rolling again. Not great, just less terrible. Holding around 210 W borrowing strength he didn't think he had. So, how did Jasper manage this? Here's where the hidden number emerges clearly. So, let's talk about his training, including durability, Jasper's secret weapon. Here's how his last 13 weeks of training before the event actually looked. In weeks one to three, this was a threshold foundation block, a mix of over unders and steady state threshold. In week three, we introduced the durability elements, so efforts under fatigue and a big intense aerobic day to round out the block. In week four, it was reload volume and intensity cut in half. Then week five, we start up again. a short taper for a big day out on the bike, testing his mental resilience on a 9-hour ride. Type two fun if you ask me. Week six, he maintains some intensity and we do some testing getting ready for the full next block. In weeks seven to nine, we did a full V2 max block with mostly short efforts, so sprint style efforts, but also we kept progressing the durability work with some cadence work at fatigue and also some temp tempo work at the end of rides. In week 10, it was a rest week with some freedom for a V2 max fart lick session for a bit more type two fun. In weeks 11, 12, and 13, now we are switching to peak and tapering. We're working on stacking intensity, so mixed efforts specific to the event and what you would experience in a race and some lastminute short intensity while cutting volume. Now, let's look at the proof of this durability training and how it worked. For example, after 1500 kg burnt, a good 2 to 3 hours into riding. If you look at his 5minute power, it improved. In 2023, Jasper could hold around 231 watts. But in 2025, after durability focused training, his holding went to 274 watts, and that's nearly a 20% jump at the same fatigue level. Numbers don't lie. These strategic fatigue focused structure and workouts gave Jasper real measurable improvements. By the final climb, Cole Grande, Jasper had burned through 2,750 kg. Last year, that much fatigue cost him almost 30% of his starting power. Torque fell nearly 1/5 and cadence dropped 6 RPMs and heart rate drifted at 11%. This year, power down just 15%. Torque barely budged. Cadence 3 RPM, heart rate drift was 4%. So, that is durability made visible. So after all the chaos on race day, Jasper crossed the finish line in 5 hours and 25 minutes. He was 24 minutes faster than last year. The gap to the age group winner was cut in half and a new critical power validated at 298 W. Talking to him afterwards, you could see exactly what the numbers meant. It was kind of this effort where you hurt more than ever, yet you feel prouder than ever. I did the Grand Fondo the year prior and and it was my best day on the bike. I never had worked harder. I was really happy with the outcome. But the following year, I wanted to figure out what would what could happen if if uh coach and I really took it to the next level. So, we worked for almost 6 months together um 6 days a week. And in the end, I had a shocker of a day. I actually got sort of bonked in under eight and was really miserable. and I still shaved almost 30 minutes off of my time and set PRs on all the big clims. And this was not feeling well, which just goes to show how much capacity we had built. And um it was incredibly uh exciting and makes me wonder where else we can go from here because we live in a world obsessed with perfect data, seamless automation, total optimization. But Jasper's journey reminds us it's the messy moments, the crashes, the struggle, and the unexpected challenges that truly define us. Jasper proved that it's never too late to redefine what's possible to discover strengths you didn't know existed. If Jasper can dramatically transform himself after 50, imagine what you can do in the next 90 days. And a great place to start is the lessons that I've learned as a coach in this video.