I got a similar thing on my last leg day.
I was doing Leg Extension > Lunge supersets and found on the lunges that I got an uncomfortable stretch (almost strain) in my hammies. My hamstrings are quite flexible however and I did warm up properly.
I tend to think lunges hit the hamstrings and hip adductors as much as the quads, because they all stretch out under the load.
As for the balance thing, I think it takes time you have to work up to it. Bear in mind that after squats and GM's your legs are propbably pretty shakey.




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