@Laurie-Sawyer said in HARD TIME WITH GESTURE DRAWING!:
@Mariana-Garcia Todd Bright hosts a gesture drawing workshop every Saturday morning, 10 am EDT. We have live models every week with a theme. It is called All in Gesture. You can pay $10 to try out the session.
Thanks for this suggestion, I may try Todd Bright's Saturday morning class out.
On the topic at hand...
I'd offer more thoughts but I think you're pretty well covered from some of the advice already given. Just keep looseness and flow in mind, don't try to over render or draw the body, and I think for starting out keeping it to basic lines (S & C) with some circles and ovels to suggest major body shapes like the ribcage and hips is a good place to start. 
Now this may just be me, but I'll put it out there anyway, I also try to remind myself constantly that these are not for show, not for impressing anyone, not for impressing myself or anything. It's so easy to get caught up looking at people who do AMAZING gesture drawings, so good that they can literally make a book of them and sell them since they're almost art in and of themselves. But those people have been doing this for decades typically. I have a tendency to always want what ever I'm doing to be something worthy of showing and that can massively get in the way of actually learning and only leads to frustration. I'm much better than I used to be at this, Haha!