I’m a trainer with a history of injury-prone knees—when I have five minutes spare I use this simple gym ball routine to help protect them

Woman exercising with her feet on a large red exercise ball.

The hamstrings and glutes play an unsung role in protecting your knees.

That was the major lesson I took away from my physiotherapist after tearing both anterior cruciate ligaments on the soccer field—in separate incidents in my late 20s and early 30s.