Planks challenge

I am excited to join the Planks Challenge for the next six weeks. I am still in the midst of the push-ups challenge, so I plan to alternate days.

For my pre-test today, I held a plank for one minute. I started shaking at about 20 seconds in. I felt it the most in my lower back. My teenage son tried it too, and he went 90 seconds. He's going to do the challenge with me.

#80. 101 things in 1001 days. Complete at least one other athletic challenge.