A trainer says you should do this one exercise if you want strong, healthy knees

Woman wearing red leggings and black top doing bulgarian split squat in an outdoor park gym.

Knee injuries are incredibly common ,which is why it's important to look after the joint if you want to keep walking, running and jumping without pain.

One of the best ways to do this is by adding some lower-body strength exercises to your workouts. Personal trainer Elle Linton says there's one exercise she recommends to all her clients who want stronger knees.