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With back to a tree, get on all fours so that heels are a few feet away from tree trunk. Place both forearms on ground, elbows underneath shoulders.
Straighten legs behind you one at a time and walk feet up tree until body is parallel to ground. (Beginners can keep feet on ground for a traditional plank or rest feet on a low step instead.) Hold for 10 seconds, then rest 10 seconds. (As you improve, increase hold and rest by 10 seconds until you can hold for a full minute.) Do 2 reps.
Tip: To make it easier, walk your feet higher on the tree trunk while still keeping your abs engaged and back straight.