Before starting, please remember to do all of these exercises within your level of comfort. Start slow!
Knee to Wall Mobilization
Stand with your foot touching the wall. Stand with a split stand the use the wall for support, if necessary. Bend you front leg slowly until you knee touches the wall. Remember to keep your foot flat on the ground and your knee in line with your foot. Repeat on other leg/ankle.
Kneeling Achilles Stretch/Ankle Mobilization
While in the kneeling position, bring your knee forward over your toes. Keep you heel on the ground. This exercise is best performed without shoes. Repeat for other leg/ankle.
Ankle Circles
Move your ankle in a circular pattern one direction for several repetitions and then reverse the direction. Repeat on other leg/ankle.
Pictures and information taken from HEP2Go.com