Here's my gestures for day 4!
Today I took the advice of @Shellac-Belly to add markers where the elbows and knees are. I think this made my poses a bit stiffer and it definitely took a lot more time away from things such as form, but it definitely did help me to be much more aware of where the joints actually are. I also decided that it would be helpful if I drew basic ribcage and pelvis markers. This helped me to understand where the legs attached a lot more than without.
The suggestions I've been getting have been really changed my view on what it is to make a gesture drawing. It's difficult, but I'm sure I'll learn a lot from it!