A classic fitness exercise is trending again among U.S. trainers for its powerful impact on lower back endurance, posture, and everyday movement.

Burpees are a popular exercise, but they can put a lot of stress on your joints. You can swap burpees for other lower-impact ...

For mobility workouts from Danielle Gray — plus fitness challenges, walking podcasts, meal plans and inspiration — download the Start TODAY app! If you suffer from pesky aches and pains, there's a ...