🏃 Gait Retraining Biomechanics Simulator

Baseline Running Gait

A runner's default cadence, stride, and heel-strike pattern.

• 155–165: Typical recreational cadence (steps per minute)
• ~80%: Heel-strike prevalence (of recreational runners)
• ~1.35 m: Average stride length (at moderate jog pace)
• ~250 ms: Contact time (per footstrike)

What baseline gait looks like

Slower cadence means a longer, reaching stride per step.

Why heel strike happens

Overstriding naturally lands the heel far ahead of the hip.

Impact Loading Analysis

Vertical ground reaction force is measured at each footstrike.

• ~2.8×: Heel-strike peak force (body weight)
• high: Loading rate (sharp early spike)
• ~50 ms: Time to peak force (after contact)
• strong: Injury association (with repeated high spikes)

Reading the force spike

A sharp early peak signals hard, jarring heel contact.

Where the load travels

Impact force transmits upward through knee and hip joints.

Cadence Adjustment

Raising steps per minute shortens stride and softens impact.

• +5–10%: Target cadence increase (common retraining goal)
• ~20%: Impact force reduction (from cadence alone)
• shorter: Stride length change (at matched speed)
• reduced: Vertical bounce (less time airborne)

Why cadence matters

Quicker steps land the foot closer under the hip.

The stride tradeoff

Shorter stride at the same speed means gentler landings.

Foot-Strike Pattern Change

Shifting toward midfoot strike lowers braking forces.

• ~1.9×: Midfoot peak force (body weight)
• ~40%: Braking force drop (vs heel strike)
• minimal: Horizontal braking (foot lands under hip)
• higher: Achilles/calf load (tradeoff to monitor)

Midfoot mechanics

Landing flatter avoids the heel's forward braking lever.

A tradeoff to manage

Calf and Achilles load rise as heel load falls.

Optimized Running Mechanics

Retrained gait lowers cumulative joint loading over time.

• ~35–45%: Combined impact reduction (cadence plus strike change)
• declining: Cumulative loading trend (over training loop)
• 4–8 weeks: Retraining timeline (typical gait adaptation)
• improved: Injury-risk outlook (lower repetitive stress)

Stacking the changes

Cadence and strike changes compound into lower total load.

What sustains it

Gradual practice locks in the new movement pattern.