How to do it: Stand with your back to the wall, feet shoulder-width apart. Place your hands lightly behind your head. Slowly ...

Find out how many sit-ups after 55 signal a strong, healthy core and use this 60-second test to track your strength over time.

Core workouts can often feel like a slog, especially when the workout involves busting out endless sit-ups or crunches, which can quickly become repetitive and boring. However, this workout from Oner ...