Did day 3 of the PNWild workout, my helper(wife) was suspect. It calls for 45 second planks, first 3 sets, everytime I'd ask if she was ready, she would be a smartass, so 4th set, I don't ask. After a while I was hurting, asked her about it and got an "oops" I got up and looked at my overall timer, I'd been down there 2:30. Can't complain, it's just more of a workout, but I've reminded her a few times about it today!