As a general guideline, Doug Sklar, a certified personal trainer and founder of PhilanthroFIT in New York City, recommends ...

Crunches are great for strengthening and toning your core muscles, specifically the rectus abdominis (AKA your six-pack) and ...

Pilates was one of the first exercise methods to focus on isolating and engaging the transverse abdominis. The rectus abdominis, commonly called the "six-pack," is a large muscle that runs along the ...