I still don’t see how using little to no weight puts unnecessary stress on the knees, also how can you say that hypers/reverse hypers do a better job stressing the hamstring in the same manner in sports…in sports, you run, which requires bending the knees, so how are those more related to sports? I’m just curious, not trying to bash in any way
Trust me, you aren’t bashing. The questions you are asking are befuddling, however. The knee being bent doesn’t mean that the knee is actively flexing to a significant degree. When running, jumping, etc. you are most definitely flexing and extending (the key) the hip, which is how the hamstring is stressed in those other lifts.
A bodyweight GHR–done correctly–most definitely does place a ton of stress on the hamstring around the knee. Most people do them poorly, so maybe not, but even then, it is a glorified leg curl. Nothing more, nothing less. If you find leg curls having a significant place as a hamstring exercise in your program, then by all means include them. I’ve used them in the past and found no benefits over the other exercises mentioned and plenty negative.