No muscle roller, no problem. Dr. Fredericson recommended two effective stretches that only call for a wall or curb. Place your foot up against the wall, toes pointing up, and lean slightly forward while keeping your leg straight. You'll feel a stretch behind your knee and in your calf muscle. Hold for as long as you need to, then bend your knee while keeping your foot in the same position and hold again. These easy stretches loosen up your two main calf muscles, and they're particularly effective in combination with foam rolling.
Image Source: POPSUGAR Photography