April
Quadriceps (front of the thigh)

Groin / adductors (inner thighs)

Back (lower back & spine)

Hamstrings (back of the thigh)

Calves

Gluteal muscles

Related video:
Quadriceps (front of the thigh)

Groin / adductors (inner thighs)

Back (lower back & spine)

Hamstrings (back of the thigh)

Calves

Gluteal muscles

Related video: