2026-05-25 · 4 min read
Vert training for trail — how to actually train climbing
Most common mistake from runners moving from road to trail: thinking that "if I run more miles I'll be ready for the mountain." Nope. The capacity to climb 5,000 ft in a race doesn't come from flat running — it comes from specific, sustained vert, week after week.
How much vert you need per goal
| Goal | D+/week at peak |
|---|---|
| Trail 25K (<3,300 ft) | 2,600-4,000 ft |
| Trail 50K (5,000-8,200 ft) | 5,000-8,200 ft |
| Ultra 100K (10,000-16,400 ft) | 10,000-14,800 ft |
| 100 miles (20,000+ ft) | 15,000-21,500 ft |
| Vertical KM (3,300 ft in <3 mi) | 5,000-6,500 ft, concentrated |
Practical rule: your weekly peak D+ should be 60-100% of your race D+. If your UTMB OCC has 11,500 ft, aim for 10,000-12,000 ft/week during peak weeks (4-5 weeks pre-race).
Three session types that actually move the needle
### 1. Sustained moderate climb (60-120 min)
One long continuous climb at Z2 to low-Z3. NOT "climb intervals" — actual 60-120 min uninterrupted ascent. If your trail isn't long enough, repeat segments or do loops.
Benefit: teaches your body to hold aerobic output uphill for hours. The engine of any ultra trail.
Frequency: 1/week in base, up to 2/week in peak.
### 2. Hill reps (steep climb intervals)
Uphill repeats of 2-6 min at Z4 (threshold) or short Z5 (VO2max). Recovery: walk-down or super easy jog back.
Schemes that work:
Benefit: lactate threshold uphill + climbing economy.
Frequency: 1/week in specific block (8-12 weeks pre-race A).
### 3. Loaded power-hiking (60-90 min)
Fast hiking uphill with extra weight (weighted vest 10-20 lb, hydration pack loaded with 4-6 L water). Grade 15-25%.
Benefit: specific strength in quads, glutes and calves in the climbing pattern. In ultra trail, 30-50% of total race time is power-hiking.
Frequency: 1/week in peak (not earlier — needs muscular base).
What people get wrong
### Mistake 1: short hill reps as the only "vert session"
8 × 30 sec uphill is not vert training. It's a cardio workout with some gradient. Your body never learns to sustain 2 hours of climbing if it never spends more than 30 sec at a time uphill.
### Mistake 2: treadmill at 6% incline
Useful as backup (rainy days, can't get out). But the treadmill does NOT train what matters most: technical descent, proprioception, constant cadence changes and ankle torque. If you live in flat city and train for UTMB, one weekend in real mountains beats four weeks of 6% treadmill.
### Mistake 3: climbing hard, descending easy
The descent extracts a quad toll no other stimulus replicates. Doing 4 hours of climbing + conservative descents does NOT prepare you for technical downhill at UTMB.
Better: in the last 3-4 weeks pre-race, do conscious technical descents — faster than you think, focused on footing and elastic rebound.
### Mistake 4: copying Kilian's volume
Elite mountain athletes do 50,000 ft/week in peak. That's 3-5 hours of climbing daily, every day. For an amateur with a job, replicating that = guaranteed injury in 4-6 weeks. Rule: ramp your weekly D+ by 8%, not double.
Typical weekly integration (amateur, 50K trail goal)
| Day | Session | D+ approx |
|---|---|---|
| Mon | Rest or flat regenerative jog | 0-150 ft |
| Tue | Hill reps (5 × 5 min Z3-Z4) | 1,600-2,300 ft |
| Wed | Z2 flat jog | 150-300 ft |
| Thu | Sustained climb 75 min Z2-low Z3 | 2,300-3,000 ft |
| Fri | Rest or easy bike | 0 ft |
| Sat | Long trail with real vert | 2,600-4,000 ft |
| Sun | Z1 recovery jog | 150-300 ft |
Weekly total: 6,900-9,800 ft. For a 50K race with 6,500 ft D+, this puts you at peak.
How Vetta builds it
The [Vetta](/signup) engine reads your goal (distance + D+ + date) and plans the vert sessions automatically. It filters archetypes by your inventory (if you marked access to real mountain, prioritizes outdoor; if treadmill only, falls back to inclined treadmill with disclaimer). Weekly D+ ramps progressively respecting ramp_seguro (+8% max).
[Connect Strava](/signup) and the engine computes your historical weekly D+ and shows you exactly how far you are from your peak target.