Day 2: Same as day 1, I did 25 sec today

Day 3: My legs were sore, so it was a bit painful, still did it, I'm impressed by myself.

20 sec weren't too much hard, I enjoyed 20 sec plank

Day 2: My legs were paining a bit, but I did it with 4 breaks today

Did it today in 5 steps of 20 squats each with 5 to 10 sec break, I hope I'll do it without break soon.