Calf raise against wall - bilateral ("Heel raises" Gastrocnemius strengthening, back to wall, standing)

Stand up straight with your back to a wall.
Your legs should be approximately hip-distance apart.
Leaning against the wall for support, rise up onto the balls of your feet, lifting your heels from the floor.
Control the movement as you lower back down and repeat.
Ensure you keep your legs straight by clenching your thigh and buttock muscles, and look directly ahead.