Side Plank (w/ Reach Through)
1) Get in the side plank position - start on all fours and extend your legs back behind you. Put your arms directly under your shoulders. Shift the weight to your left side and twist your body towards the ceiling - this will cause your right arm to come off the floor. Your legs, hips and shoulders should all be aligned.
2) Lift your right arm up towards the ceiling.
Note: to balance yourself you can scissor the feet - the right leg in front of the left. Alternatively, you can place your outer leg directly on top of the inner.
1) Lower your right arm and reach through the gap between your left oblique and the floor. As you do this, raise your hips towards the ceiling.
2) Pause for a second. Now, reverse the movement back to the starting position.