Exercise routines.

I<3Dolphins • I`m a 23 year old Military wife. My husband and I have been TTC #1 since November 13, 2013. ✨
What are your exercise routines? 
Do you do work outs from your memory or do you follow videos? 
​What are some core exercise? (I would really like exercises where I don't have to get on the ground.)  I have awful back problems. I can't lay on my stomach or stand to long or even wash dishes without my back hurting. And I know that is not healthy. 
​Any advice is welcome! :). Thank you!