day 4 of 30: plank challenge

Today was day 4 of the plank challenge and the last of the 30 seconds. Tonights plank was a bit of challenge due to having just had an intense workout only an hour before. I had to be reminded to breathe. And what you will not see in the video is how much my arms are shaking. However, my form has gotten better (butt is staying down). Whenever you see me arch my butt up and shake my leg, it's due to having some knee problems… bare with me, I do add a couple of seconds to the plank to make up for it.