Ski Legs Don't Hike: A Colorado Trainer's Guide to the Spring Training Transition
Published April 23, 2026 | By Sean Sewell, NSCA-CPT | Colorado Personal Fitness
Estimated read: 6 minutes
The Colorado spring training transition is the eight-to-twelve week block between the last ski day in May and the first big hike or 14er in July, during which skiers and splitboarders have to intentionally rebuild their aerobic base, ankle mobility, and long-duration endurance before the ground hardens under a summer pack. It's the period most Colorado athletes skip — and it's the single biggest reason so many hikers, runners, and bikepackers limp home from their June trips wondering what happened.
Here's the short version: ski legs don't hike. The same quads that felt bulletproof carving Vail bowls in March cramp up at 11,000 feet in June. This guide is the training plan I put my own Colorado Personal Fitness clients on the moment the chairs stop spinning.
Why your ski legs aren't hiking legs
Downhill skiing is a sport of short, intense, mostly-anaerobic bursts with long rests on the lift. Your quads and glutes get very strong at eccentric loading (absorbing force on the way down), your core gets good at rotational stability, and your aerobic system gets a real but uneven workout depending on how much backcountry touring you did.
Hiking — especially Colorado hiking, which almost always means uphill at altitude — is a completely different demand:
Long-duration aerobic steady-state (2 to 10+ hours)
Concentric force production pushing up stairs, rocks, and switchbacks
Calf and posterior-chain endurance that skiing doesn't touch
Ankle mobility and stability across uneven terrain, something ski boots actively suppress for five months
Altitude-adapted aerobic capacity that degrades faster than most people realize after a few months off the trails
If you jump from your last powder day straight to a 14er attempt, your cardiovascular ceiling is fine, but your specific musculature and ankle architecture are not. The training transition is how you bridge that gap.
The 8-week spring transition framework
Here's the framework I use with clients, built around four phases. Adjust based on whether you're targeting 14ers (longer), technical scrambles (more ankle work), or bike-heavy summers (less calf focus, more posterior chain).
Weeks 1–2: Decompress and mobilize
After ski season, your hip flexors, calves, and thoracic spine are locked up from boots and layers. Don't train hard yet. Train mobile.
3x per week: 20-minute mobility flow — TRX hip openers, ankle rockers, thoracic rotations
2x per week: 30–45 minute Zone 1 walking (60% max HR), flat terrain
1x per week: light full-body kettlebell circuit, nothing above RPE 6
Weeks 3–4: Rebuild the aerobic base
Now you start putting in the unglamorous aerobic work that actually carries 14er summits.
2–3x per week: Zone 2 cardio, 45–75 minutes, nose-breathing pace (roughly 70% max HR). This is the single most-skipped training zone for Colorado outdoor athletes. Don't skip it.
2x per week: full-body strength with kettlebells + TRX. Focus on single-leg work (reverse lunges, step-ups, split squats) and carries (suitcase, farmer's, overhead).
1x per week: ankle and calf-specific work — calf raises (3 x 20), tibialis raises (3 x 15), single-leg balance work (30 seconds each side, eyes closed).
Weeks 5–6: Add vertical
This is when the trails dry out in the Front Range and you start getting on real terrain.
1x per week: weighted hike or uphill treadmill session. Start with 15 lbs in a pack, build to 25 lbs. 45–60 minutes.
1–2x per week: Zone 2 cardio, now 60–90 minutes
2x per week: strength, shifting emphasis to posterior chain — Romanian deadlifts, kettlebell swings, good mornings
Saturday: short local hike, 4–6 miles, under 2,000 ft elevation gain
Weeks 7–8: Specificity
Train the actual thing you're about to do.
1x per week: long effort on real terrain — 6–8 miles, 2,500–4,000 ft elevation, pack weight matching target objective
1x per week: Zone 2 cardio, 75–90 minutes
2x per week: short strength sessions (30 min max) to maintain, not build
Recovery day: mandatory — foam roll, walk, hydrate, sleep
Five exercises that directly transfer
If you do nothing else, do these five. They're what I assign when a client calls me 4 weeks before a trip and asks what to do.
Bulgarian split squat — 3 sets of 8 per leg. Builds the exact single-leg strength that carries you up switchbacks.
Kettlebell swing — 5 sets of 15. Hinge pattern, posterior chain, aerobic-to-anaerobic bridge in one move.
TRX pistol progressions — 3 sets of 6 per leg. Ankle mobility, balance, and single-leg strength.
Suitcase carry — 4 sets of 60 seconds per side, heavy. Grip, core, and gait endurance for long days with a pack.
Calf raises, single-leg, slow eccentric — 3 sets of 15 per leg, 3-second lower. The boring one nobody does. The one that stops June cramping.
What about the aerobic work at altitude?
If you live in Denver (5,280 ft), every Zone 2 session is already delivering some altitude adaptation. If you live at sea level and you're traveling to Colorado for a summer trip, give yourself at minimum 48 hours at elevation before your objective, hydrate aggressively (3+ liters/day), and reduce your first-day distance goal by about 30%. The training transition doesn't replace acclimatization — it just makes your acclimatization window more productive.
Frequently asked questions
How soon after ski season should I start this? Within 7–10 days of your last ski day. The longer you wait, the more base fitness you lose and the harder the ramp-up becomes.
Can I do this program on my own, or do I need a trainer? The framework works unsupervised if you already have good lifting form. If you're newer to kettlebells or TRX, one to three form-check sessions with a trainer saves months of inefficient reps. Book a consult with Colorado Personal Fitness.
I'm not doing 14ers — I just want to hike comfortably. Do I need all eight weeks? No. Weeks 1–4 alone will put you ahead of 90% of recreational hikers. Add weeks 5–6 if you're planning anything over 2,000 ft of gain.
What if my goal is mountain biking, not hiking? Replace the weighted hike with a long ride, keep the single-leg strength and core work, and add more rotational and grip exercises. The backbone of the program — Zone 2 base, single-leg strength, ankle mobility — still applies.
Do I need to stop skiing entirely during this? No. Spring corn days and late-season backcountry tours are fine. Just don't use them instead of your Zone 2 and strength sessions. Ski for joy; train for your summer.
The bottom line
Ski season builds a specific athlete. Hiking season demands a different one. The spring transition is where good Colorado athletes separate from the people limping off the trail in June clutching their calves.
If you want help customizing this framework to your specific goal, schedule, and current fitness, work with me directly at Colorado Personal Fitness. First session is always a full assessment — we map your real baseline before we change anything.
About the author
Sean Sewell is an NSCA-certified personal trainer, StrongFirst senior instructor (SFG, SFB, SFL), and AIARE Level 2–certified ski mountaineer based in Denver. He founded Colorado Personal Fitness in 2011 and has been training mountain athletes for over 15 years. Learn more about Sean.
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