@fathin-shihab thank you for the inspiration here. I too have been so focused on work and not exercising enough. I'll typically do a few yoga moves right when I wake up to strengthen my back (cat-cow is my favorite), but I've been definitely been slacking in the work out dept.
I'm a huge fan of working out from home without needing any heavy duty equipment. Your suggestions here are really great. I definitely need an ab wheel and ball! The ball is actually really great for sitting and working on as when you sit and write/work it helps to stimulate and strengthen you neurologically as you unconsciously balance yourself while simultaneously moving your mind!
The cat-cow movement is very good for lower back pain. especially when you sit many hours in front of the pc.