Horrible form. First video you didn't *complete* a single lunge. Second video you completed 6 lunges on your left foot forward, and two on your right foot forward. You're going to develop a massive imbalance if you keep it up.
1: *always* touch (not bang) your knee to the floor.
2: *always* step forward the exact same distance on each leg, for each step. Put tape on the floor, use chalk marks, step on seams on the floor, whatever, just make sure each lunge is the same distance.
3: Don't pause between steps. Do you stop with your feet together when you walk? No? Then don't do it when you do walking lunges either. It's walking lunges, not line-dancing lunges.
4: Don't lean forward. Back straight and straight up, arms at your sides, weights should be at your hip. You're leaning forward too much, and you'e leaning forward at different angles for each leg, so yet another source of imbalance.
5: 5 reps per leg? Drop the weight to 20 kilos and do 20 steps, 10 per leg, with perfect form. If you can't control your knee touch and it bangs on the ground at the end of a set, lower the weight.
I agree with most. It's just not worth it dude. Too much lean which gets you on your toes which stresses the patellar tendon. I have a knot of scar tissue on my left knee from this very thing from like 15 years ago in college. I'm not a fan of lunges period. I would rather do split squats. I don't think the knee is set up good to stop forward progress at or about 90 degrees, much less with added resistance. Plus flat bottom shoes are king for any heel drive based movement. You will be able to tell a difference I almost guarantee. You don't want a shoe that's designed to bounce and roll your heel forward. Pretty much the last thing you want.
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