David Kirsch may train celebrities like Jennifer Lopez, Britney Spears, and Heidi Klum, but thanks to the power of the Internet, we like to think he's our trainer, too. Kirsch regularly posts his ...

You have to engage your core constantly as you sit straight, stand tall, and walk confidently, which requires a lot of endurance in your midsection muscles. The best way to build ab endurance? A core ...

When you buy through links on our articles, Future and its syndication partners may earn a commission. Credit: Getty Images If you have 10 minutes to spare and a couple of dumbbells to hand, then this ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." No offense to sit-ups, planks, and hollow holds, but basic core exercises can feel drab day after day.

You can always make time for your fitness goals! Try this quick and effective at-home ab workout to strengthen your core and ...

As a runner, you don’t want to neglect core strength. These key midsection muscles provide the stabilization and upright posture you need to run efficiently and injury-free. And you can really turn up ...

"Sometimes pressing play and just starting is the hardest part," says fitness instructor Tanner Courtad in this total-body workout video. "But what you'll always find out is that you build momentum, ...

Better posture. Weak upper abs often result in poor posture and spinal misalignment, but by targeting these muscles, you can ...

Time is a precious commodity, and sometimes, finding time to squeeze in physical activity, like a 30-minute HIIT workout, or a group fitness class can be challenging. However, coach Raneir Pollard has ...

While crunches, sit-ups, planks, and other floor-bound movements are effective core-strengthening exercises, standing abdominal workouts offer unique benefits, especially for runners. If you’re ...

Feeling inspired by Livvy Dune’s abs, but don’t quite have the same amount of hours to spend in the gym as her? We’ve good news: you actually don’t need *that* much time to make a difference when it ...