Sit-ups are a great way to work your abs, but they're not the only way to strengthen your core. And, anyway, endless repetitions of sit-ups and crunches can get a bit boring after a while.
Fortunately, you can shake things up with this short, 10-minute core workout. You don't need weights either — just a single resistance band. The best resistance bands often come in sets of several strengths, so you can find one that'll challenge your muscles.
