Plank Up-Down

What it is

You move from a forearm plank to a high plank one arm at a time, then back down. It combines core stability with triceps and shoulder work. Alternate the leading arm and keep the hips from rocking.

Technique tips

• Feet a little wider than hips for stability
• Place each hand under its shoulder
• Keep the hips level as you switch
• Alternate the leading arm each rep

How to track your progress

Log reps, and add the extra load if you wear a belt or a vest. Straddly counts your bodyweight in the estimated max, so added weight and extra reps both show up as progress, and new records are flagged during the session.