Move over lunges — I teach weightlifting, and this is the one exercise I'd use instead

You don't need lunges to build stronger legs with knee pain; just try this personal trainer's alternative, called the suitcase deadlift.
Mens Fitness on MSN

The One Exercise Every Man Should Master, According to a Trainer

If there's one exercise you should master, it should be the squat, according to Vinn Reddy, trainer and founder at Vinn Reddy Personal Training Fitness.