Torch calories and sculpt your body with this express Tabata HIIT workout! No equipment and no talking—just follow along for ...

Jumping jacks in all variations–FITBOOK author Nina Ponath did at least 200 of them every day for 10 days. Here, she shares ...

Jenni Tardiff, master trainer at The Gym Group, recommends beginners start with this superset dumbbell sequence to build full ...