The standard advice for hiking preparation is to walk more. This is correct as far as it goes, but it misses the most specific physical demand that mountains place on the human body: sustained eccentric load on the quadriceps and knees during long descents. The uphill is what gets you breathless. The downhill is what gets you injured.

Effective physical preparation for hiking is not simply about cardiovascular fitness or even general strength. It is about training the specific muscles, movement patterns and joint tolerances that mountain terrain demands — and it requires enough lead time to allow the body to adapt without injury.

The Two Demands Mountains Actually Make

Demand 1: Sustained cardiovascular effort at variable intensity

Mountain hiking is aerobic work at 50–75% of maximum heart rate for extended periods, interrupted by higher-intensity bursts on steep sections. This is well within the training range of most moderately active people — the cardiovascular system adapts relatively quickly with consistent aerobic training (6–12 weeks of 3x weekly 45–90 minute aerobic sessions). The limiting factor for most hikers is not the cardiovascular system. It’s the musculoskeletal system.

Demand 2: Eccentric muscle loading on descent

Descending a steep trail requires the quadriceps to contract while lengthening — this is called eccentric contraction. Eccentric loading is dramatically harder on muscle tissue than concentric (shortening) contraction and is the primary cause of Delayed Onset Muscle Soreness (DOMS) in the quads after a long descent. Undertrained descending leads to muscle fatigue, loss of knee stability, altered gait and the majority of ankle sprains and knee injuries in hiking.

The Training Programme Structure

Phase 1: Foundation (8–12 weeks before the trip)

Build the aerobic base and begin introducing load through walking. The specific exercises for this phase:

• Loaded walking (3x week) — walk with 10–15% of body weight in a pack; increase duration by 10% per week; prioritise terrain with hills
• Step-downs (3x week, 3 sets of 15 per leg) — stand on a step, lower the non-working leg slowly (3 seconds) until the heel nearly touches the floor, return to start; this is the single most specific exercise for descent preparation
• Single-leg balance (daily, 60 seconds per leg) — builds the ankle proprioception that prevents sprains on uneven terrain
• Hip hinge movement (Romanian deadlift, 3×10) — loads the posterior chain that supports the lumbar spine under pack weight

Phase 2: Specificity (4–8 weeks before the trip)

Introduce terrain that replicates the challenge. This means actual hills, actual packs and actual multi-hour efforts:

• Long day hike (1x week) — minimum 4 hours; include sustained descent; pack weight approaching trip weight
• Stair training (2x week) — stair climbing and descending with pack; 30–45 minutes; mimics sustained elevation change without requiring mountain access
• Trail running short sessions (1x week) — 20–30 minutes on mixed terrain; builds ankle stability and ground-feel that carry over to hiking movement

Body-Weight Management for Multi-Day Treks

Every kilogram of body weight travels uphill and, more importantly, downhill with you. On a steep mountain descent, ground reaction forces on the knee can reach 4–8 times body weight. A 10kg excess body weight translates to 40–80kg of additional peak joint load on every step downhill. This is not a weight loss recommendation — it is a biomechanical reality that affects injury risk in direct proportion.

The practical application: start physical preparation 3–4 months before a demanding trek, not 3–4 weeks. The adaptation required — increased muscle fibre recruitment, improved tendon stiffness, enhanced joint proprioception — takes weeks to develop and is not amenable to crash training.

The Joints That Need Specific Attention

Knees

Patellofemoral syndrome (pain under the kneecap on descent) and IT band syndrome (pain on the outer knee on descent) are the two most common overuse injuries in hikers. Both are caused by inadequate quadriceps and hip abductor strength. Prevention: step-downs, clamshells (hip abduction exercise) and walking lunges. Treatment during a trek: trekking poles reduce knee load by up to 25%; Kinesio tape applied in a patellofemoral unloading pattern reduces pain enough to continue; ibuprofen is a temporary anti-inflammatory but does not address the underlying cause.

Ankles

Ankle sprains are the most acute trail injury. Prevention is primarily terrain adaptation — the ankle’s proprioceptive system needs to be trained on uneven ground, not just flat gym floor. 6 weeks of single-leg balance training on a balance board or BOSU significantly reduces ankle sprain incidence. If a sprain occurs on trail: RICE protocol (Rest, Ice if available, Compression bandage, Elevation), assess weight-bearing ability and make descent/evacuation decision based on mobility, not pain alone.

Lower back

Pack weight carried with a poorly fitted or improperly adjusted harness loads the lumbar spine in extension, causing muscle fatigue and lower back pain on multi-day treks. Prevention: hip belt adjustment (weight on the hips, not shoulders) and hip hinge strength training. Treatment: frequent pack-off breaks, lumbar stretch and anti-inflammatory medication for acute episodes.

Acclimatisation as Physical Preparation

For any hiking above 2,500m, altitude acclimatisation is a non-negotiable component of physical preparation that no amount of sea-level training can substitute. The specific protocol:

• Ascend no more than 300–500m in sleeping altitude per day above 2,500m
• Spend at least one rest/acclimatisation day for every 1,000m gain in sleeping altitude
• The principle “climb high, sleep low” — day hikes to higher altitude followed by descent to sleep — accelerates acclimatisation
• AMS (Acute Mountain Sickness) can affect even physically fit people at altitude — fitness does not protect against altitude illness; acclimatisation protocol does