Yep. For me, that "much harder" is a painful knee joint. If your joints go, then you can't exercise. Don't risk it. Get the vitamins needed for bones and cartil

Yep. For me, that "much harder" is a painful knee joint. If your joints go, then you can't exercise. Don't risk it. Get the vitamins needed for bones and cartilage. Don't risk a slip on ice or down a staircase. Don't choose downhill skiing or tackle football as your exercise.