There are many sit-up variations that can help you achieve your weight loss goals, as well as keep your fitness regime ...

Bad posture during sit ups is a constant source of grief for ... To confuse matters even more, there are a lot of variations and it can be cumbersome to know which works best for you.

Naturally, your go-to core workout might include a variation of sit-ups, crunches, and planks. Because as a runner, you know how important training your midsection is to improve your performance.