/ic/ - Artwork/Critique

What's a good book with exercises to try?

I've read a bunch of books about art, but I barely get a chance to try drawing shit and I'm really behind on it.

I've been drawing crap for too long and I just recently got a critique that gave me a reality check about it, mentioning how my drawings lack any formal foundations and that I should try re-learning anatomy again.

Before that I used to study Loomis' plates while I drew, but it only helped me to keep bare proportions right, without understanding the anatomy behind it.

Any ideas?

TL;DR: my drawings are shit, must go back to fundamentals, but i need a book with exercises and not so much on theory.