We had this discussion, a couple of years ago, on a different thread. I mention it again, as I had great results on fewer than 8 reps.
When I started fell racing, I discovered that my legs were not strong enough on the descents; they were physically buckling below me as I chased the leaders. In the absence of any real hills locally, I used heavy weights and 1 set of 3-6 squats to build up strength without weight (using competitive weightlifting techniques). If I couldn't do 3 the weight was too heavy; if I could do 6 it was too light and I'd add one kg for next time.
This worked really well for me, (although I appreciate it might not work that well for everyone). I got a lot stronger, without adding any body weight, and it only took a couple of minutes three times a week.







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