Two-Point Plank
How to do: Assume a push up position, making sure your body forms a straight line from your shoulders down to your toes. Raise your right hand and left leg out to form a straight line with your body, hold for two counts, then return to plank position and repeat with the other arm and leg. That’s one rep. Do 2-3 sets of 10-20 reps, several times per week for best results