I have been doing Anim School for a while and just finished Body Mechanics Class 2. Here's the three assignments, lots of fun and learning the past semester.
First up, simple walk to stop with a little attitude in there.
Second was a jump assignment. I was lucky to be able to film the reference on a balance beam myself at my university's gymnastics gym.
Last, and probably the funniest reference I've ever found online, was the "interacting with a heavy object" assignment. After I found the little gem of reference, I couldn't resist.