I did plank holds every day for 30 days and felt my core and arms get stronger. Here's how I learned to level up with plank ...

Plank variations (mountain climbers, push-ups, and side planks)— 20 seconds on, 10 seconds rest, for 2 sets DAYS 16-30: Advanced plank variations (side planks, planks with shoulder taps ...

Holding a plank targets the abdominals, obliques, back, arms, and shoulders. Learn the correct form for this muscle-building ...

You get all the strength benefits of a plank (think: a strengthened core, shoulders, back, and legs) plus the benefits of ...