What muscles are needed for cycling & running

Ever wonder what muscles and tendons are needed for cycling and running and what percent from each group of muscle are being used?

Running Power Contributions (approximate)

Muscle/Tendon Group	Contribution to Power (%)
Glutes	30-40%
Hamstrings	15-20%
Quadriceps	15-20%
Calves	10-15%
Achilles Tendon	20-30% (elastic recoil)
Plantar Fascia/Patellar Tendon	5-10%
Hip Flexors/Core Stability	Essential for efficiency

Cycling Power Contribution on a Road Bike (approximate)

Muscle/Tendon Group	Contribution to Power (%)
Quadriceps	35-40%
Glutes	20-25%
Hamstrings	10-15%
Calves	10-15%
Hip Flexors	5-10%
Core Muscles	Essential for stability

Cycling power Contribution on a time trial bike (approximate)

Muscle/Tendon Group	Contribution to Power (%)
Quadriceps	40-45%
Glutes	25-30%
Hamstrings	8-12%
Calves	10-15%
Hip Flexors	10-12%
Core & Lower Back	Essential for stability