I am doing jump lunges as one of my exercise(. I read online that you should be able to do 8-12 reps in 4-5 sets with 45-60 sec rest in between. In the first set I was able to complete 12 jump lunges(excruciating pain), the second set I went down drastically to 5 and after that to 3 and after that my legs just give out when I attempt another jump. Maybe I am doing it wrong somehow or maybe I am just too weak. Does each side of the leg count as one rep or is it after completing both legs does it start to count as one rep?
Side note this also happens when I do push ups 28 reps per set
Are there any solution to this and how do i keep training when I keep failing after the 2-3 sets?