Wall Calf Stretch With Bent Knees Take the same position as above with both hands on the wall, one foot behind the other. Instead of lunging forward, bend both knees to drop your weight toward the floor. Keep the back heel on the floor and feel the stretch deeper in the lower part of your Achilles tendon. Hold stretches for at least 30 seconds per leg. Image Source: POPSUGAR Photography / Ericka McConnell