Sit on the floor with legs comfortably positioned. Reach one arm overhead and lean gently to the opposite side, feeling a stretch along the side of your torso and into your back. Hold briefly, then return to the center and repeat on the other side. Keep the movement controlled and breathe steadily to maximize the stretch without pain.
Log your sitting side reach stretch back sets in 1RM.fit and watch your estimated 1RM update automatically as you get stronger.