Pushups don't lie. After 50, you can tell a lot about someone's strength, joint health, and overall fitness by how many they can perform. And unlike machine exercises that guide your movements, ...

Learn how to improve push-ups with this personal trainer's advice based on common mistakes she sees in the gym.

You may still have nightmares about having to do a certain number of pushups in gym class—or as a penalty for making a mistake during a youth sports practice. These days, no one is demanding you "drop ...