[scroll for workout video] this is the best warm-up exercis..
Added 2020-11-04 18:25:06 +0000 UTC[scroll for workout video] this is the best warm-up exercise because it helps train my lower back muscles to stay on the ground throughout the majority of this ab routine. sometimes I'll do this for 20+ minutes if I'm having a really hard time keeping my lower back on the ground.
