Posemaniacs is a pretty good site for learning how to draw bodies doing things. They have a 30 second drawing challenge that flips through various poses at a steady pace, which can be frustrating for some, but it really teaches you how to quickly capture the essence of an object rather than getting caught up in minor details. It's great for getting a handle on human anatomy, perspective, and speed. Even if you have a bunch of unfinished sketches at the end, doing 5 or 6 of these a day (literally 2 minutes of drawing) can really help you after a while.
For some more basic stuff, I'd look at doing timed drawings in another way; instead of trying to draw something a quickly as possible, force yourself to spend 5 solid minutes drawing your partner. Then again in 10 minutes. 20. Etc. Forcing yourself to slow down and really look at what's in front of you really helps you learn what sorts of things are important in sketching and developing a drawing. You start paying attention to spatial stuff (like how far apart eyes are, how wide someone's face looks from straight ahead, etc)
Blind Line drawings are also really good at this. These are where you draw something without looking down at your paper. Just keep your pen/pencil/marker on the paper and spend 5 minutes trying to draw an object or person. It'll look terrible, but again, you'll focus on space and details and you'd be surprised how well some of them can turn out with a bit of practice (and how hilarious some of them can be).
Most of all though, you gotta support each other and not be afraid to give and receive constructive criticism. If every time someone gives you a suggestion, you decide your art is crap and that you should quit, you'll never improve. Art takes time. It takes many many hours of sitting down and forcing yourself to draw even when it's the last thing you want to do. You're going to be unsatisfied with some works (hell, I can barely go a week without wanting to purge everything in my portfolio). Take what things you like about them and what things you need to improve as a lesson, not an attack. Someone rattling off a large list of things that need to be fixed isn't trying to make you feel bad, they're trying to give you advice on how you can grow, and actually listening to these criticisms can be nice because you might not even realize what they're saying before they mention it.
So encourage each other to keep going, teach each other how to give and receive critique, and force each other to work work work, because art is a learned skill, so you can get better and better as long as you keep working on it.