Lean against a wall and push. Keep your feet pointing forwards, with your heels on the floor, and back leg straight.
2. Calves (soleus)
Repeat the above exercise with your back knee bent.
3. Front of thighs (quadriceps)
Stand on one leg with the supporting leg slightly bent. Keep your knees together, hold onto the wall for support, and pull the other foot up to your buttocks.
4. Adductors (inside of thighs)
Stand with your legs apart, and push your hips to the left and right.