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.

We’ve said it before, and we’ll say it again: when building a strong core, sit-ups aren’t always the best option. Not only can regular sit-ups and crunches put strain on your lower back, you’re only ...

Sit-ups can cause nausea if you experience dehydration, develop heat exhaustion, or participate in prolonged high-intensity workouts.