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Wrap 2-pound weights around each ankle (or do without weights) and get on all fours. Extend left arm up to head height and right leg back to hip height. Slowly touch left elbow to right knee; hold for 2 counts, then extend arm and leg out again. Do 10 to 15 reps; switch sides.
Too easy? Try this: Place 5-pound dumbbells in front of each hand, then lift the weight as you extend and curl.