Plyometric jumps are typically used to improve explosive strength.
I find they are excellent for improving balance and the ability to sit in a deep squat, which is helpful for hip and ankle mobility.
Let the focus be landing softly with balance - you should make first contact with the balls of your feet and end with your heels in contact with your landing surface. Aim to maintain your balance in a deep squat for several seconds upon landing. Read more
If you have enough basic mobility and strength to try some simple tumbling, you might begin with shoulder rolls. You can do these from a kneeling start and try to finish in a balanced state on one foot and one knee. Be sure to tuck your chin toward your chest and roll on the back of your shoulder, not the back of your neck.
Once you feel comfortable doing a shoulder roll from a kneeling start, you can try from a standing start. Read more