i think it's a huge jump! i literally came to the forum to see if it's just me i did day one, and was like "yay, i didn't die!". today was day 2 and i didn't check in advance bc i thought they days were all the same as in previous weeks. 8 minutes kicked my butt, and then i did 5 and 5 more. will have to repeat day 2 and then move onto day 3 which does not even seem doable at this point. i am glad i am not the only one struggling with this!