I just started doing box jumps a few weeks ago and I'm loving them. I'm at 40" right now which I know isn't very good, but I haven't tried a height yet that I can't jump on, moving up the height slowly and cautiously.  I would really like to get good at these, if there are any box jump experts out there I would love some pointers!

I failed the first attempt, it was at the end of my leg day

Your form is great ! Nice squeeze at the top to get all the muscles in your legs to activate ! 

Looking awesome man!  We all have to start somewhere!

Have you seen this video yet?

Thanks I hadn't seen that one yet. Not looking at the box when I land is something that I will need to work on!