This plank challenge from trainer Heather Robertson is under five minutes (and the whole video is under seven). You can definitely squeeze it in today!

Trainer Heather Robertson will walk you through eight different types of planks that you'll hold for 30 seconds each. You'll be doing elbow planks, side planks, plank toe taps, and more. Brace ...

The exercises are recommended by certified personal trainer Heather Robertson. She doesn’t go into detail about the number of reps, so I’d recommend starting with 5-10 reps of each exercise on ...