Start in a plank position. Bring index fingers and thumbs to meet, forming a triangle under chest. Bend elbows and lower torso as close to ground as possible. Push through palms to straighten arms. Modify this move by dropping to knees. Do 10 reps.
Start in a forearm plank. Keeping abs tight and spine long, pick up right arm and right palm on ground. Repeat on left side, ending up in a high-plank position. Now reverse the movement, replacing right palm with right elbow and left palm with left elbow. That’s 1 rep. Be sure to keep hips still and facing the ground throughout the routine. Do 10 reps, alternating starting arms with each rep.
https://www.huffpost.com/entry/the-noequipment-arm-worko_b_8148116
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