What muscles are active while running?

Primary Muscles:

1. Quadriceps (front of the thighs): Extend the knees and help propel the body forward.

2. Hamstrings (back of the thighs): Flex the knees and help with hip extension.

3. Gluteal muscles (buttocks): Extend the hips and provide power for running.

4. Calves (back of the lower legs): Plantarflex the feet (point the toes down) to help propel the body forward.

Secondary Muscles:

1. Core muscles (abdominals, back muscles): Stabilize the body and maintain posture.

2. Hip flexors (front of the hips): Flex the hips and help with lifting the knees.

3. Iliotibial band (IT band): Stablilizes the knee joint and helps with hip extension.

4. Erector spinae (back muscles): Help to maintain posture and support the spine.

5. Pectorals (chest muscles): Stabilize the shoulder joints and help with arm swing.

6. Triceps (back of the upper arms): Help with arm swing.

7. Biceps (front of the upper arms): Help with arm swing.

Running is a complex activity involving numerous muscles throughout the body. The specific muscles used may also vary slightly depending on an individual's running style and gait.