Sit-ups target the abdominal muscles, specifically the rectus abdominis ... How many sit-ups should I do a day? The number of sit-ups you should do per day depends on your general fitness level ...

The sit-up is still programmed, but many other exercises can strengthen your core muscles just as well ... not into your chest. To do this, think about directing your breath expansively downward ...

It’s a common misconception that to target our core muscles the best ... you are really engaging your obliques in a way that sit-ups and planks cannot do,” says Steve. Don’t be surprised ...

How to do mountain climbers: Get into a high-plank position with your wrists directly under your shoulders. Keep your core ...

Chris Hemsworth’s trainer, Luke Zocchi, brings you a workout that’ll leave you feeling fitter and stronger ...