Your name says it all Kimmy...You Rock! Thanks for those links and information. The About info explains the postures really well.
You make sense about why core is so important & honestly I think I keep re-injuring my lower back and shoulders b/c my core is so flabby. In the past those injuries would always prevent the continuation of the core & ab exercises that causes the injury so it has always been a vicious cycle. This time I've been starting out with reps of 3 (starting with 1 rep a day) until I can do that rep without it causing any pain and the muscles quit quivering from weakness. Core exercises that involve the shoulders - I can't manage any of the weights & the plank exercises, yet. Not sure what to do about that. But the other exercises are coming along nicely-thanks to all the information you guys have shared with me.