Side - Plank Booty Tap (lower left): Start in a side plank on left forearm (A). (health.com)
Lower leg, coming to all fours, then twist hips so you're seated on left hip with left forearm on the floor (B). (health.com)
To investigate, the team disinfected «plots» on the foreheads and left forearms of volunteers, wiping out the indigenous microbial communities. (newscientist.com)