A plank is yoga pose. kind of like a push up except you are on your elbows with your hands/arms resting out in front of you. Then you get up on your toes and being as straight as you can hold that position. It is supposed to work your stomach "core" muscles.
It is very hard to do.

I just did the plank with hubby and held the pose for 25 seconds. hubby held it for 65 seconds.
Better is better.

Planks: I used to be able to do them and had done them up to 2 minutes...now that was several years ago and at a much lighter weight.
I hate doing crunches/sit ups because I have neck issues.
My overall body is out of shape completely.
I also have balance issues. I fell onto my towel rack and bruised my upper arm the other day. Very painful, simply getting out of the shower.
I fell 2 months ago going up a curb and hurt my ribs.

I really need to work on my balance. I have exercises to do and should do them.
bizi