Take on this intense ab challenge to strengthen and tone your core before the new year! Complete 200 mountain climbers, 100 ...

Training my abs is always tough, so I figured why not push it even further? I swapped out the usual sit-ups and Russian twists for a four-move dumbbell workout to really spice things up. I've been ...

You don't need sit-ups to sculpt a strong core. Try this instead!

While classic core exercises like sit-ups and crunches are certainly an effective way to train your abs, they are not the only way. If you prefer to stay standing for your workouts, then this ...

Struggling to motivate for yet *another* at-home workout? This 28-day abs challenge is sure to keep you on track. All you have to do is press play. Start your week off with a full, 20-minute Pilates ...

Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. Sprint interval ...