Not challenging enough? Hold a weight with both hands. I did 50 stand-up sit-ups every day for a week — here are my results ...

I don't think I'm alone in saying sit-ups aren't fun. I don't know if it's because I need to have someone or something there to make sure my feet stay put on the ground during the full movement or ...

While classic core exercises like sit-ups, planks and crunches are undoubtedly effective, they’re not the only way to strengthen your abs, and if you prefer you can stay standing and do a low ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. I don't think I'm alone in saying sit-ups aren't fun. I don't know if it's because I need to ...