My legs, my legs!

As the numbers have grown in our burpee challenge, I have noticed a few things. My arms and shoulders seem to hold up pretty well, it is my legs that start to ache. How do you think you would feel if you did them like this?



Yikes.

Also, I seem to hit my wall of "perfect" burpees at around 15, so I stop and rest. I want to get full benefit from each and every one, and it doesn't make too much sense to do a bunch of half assed ones.