Occasionally I like to share skills from other arts such as Kung Fu that can be beneficial to your health and wellbeing. I choose skills that include Tai Chi principles such as relaxation, correct structure, balance, etc.
Here's a handy sequence of single leg exercises to strengthen your legs and other parts of the body from Master Yan Xin. I've incorporated a similar routine into my personal training.
The exercises are clearly explained and easy to follow. Make sure you do what you can and build from there.