For ankle strength, face inwards towards barre (or grab a chair and gently hold the top) and have your toes facing parallel (straight forward). Slowly bring your heel just off the floor, just a little bit, and then lower. Do this 10-15 times then rise onto demi pointe (the ball of your foot). Do that 10-15 then switch to the other foot.
REMEMBER TO GO SLOW! (super slow)
DO THIS AFTER WARMING UP!!! (if you don’t you will be in pain)
DO MORE IF YOU DANCE MORE! (but this is more of a stretch)