- Bring your elbows down to the ground 
- Keep your core engaged
- Try not to move your hips back and forth 
- Extend one arm then the other

Commandos

Pop jacks

-- Stand with feet shoulder width apart
-- Squat down slightly
-- Jump off the ground, while in the air, bring knees to your chest
-- Land softly

Great arm workout. Just hard enough to keep going and not quit!

Really good quick (30 minute) workout that will have me feeling it tomorrow.

The description was right. This is a killer core workout!

Great kick your butt workout to start the new week!