Pre-Workout Warm Up I would do few more warm up exercises beside these above, when you feel you're started to sweat than you can go on and start training. Warm up is important, but don't forget the cool down.
Warm up your abs and lower back with this bodyweight at home core warm up routine. Get your heart pumping and prepare your core for a strengthening workout. http://www.spotebi.com/workout-routines/bodyweight-at-home-core-warm-up-routine/