What do you think about doing heavy front squats 3x times a week? We need those powerful big legs to make some power to our shots. So why not focusing doing squats? Just forget bench press and bicep curls. We need to get all the muscles to our legs and abdominals, no too much muscles to arms and biceps. Why Front squats? Its more safe to lower back than normal squats. Plus it developes abdominal muscels more intensively.
Normal squats are only tough on the back if you have **** form or you do them powerlifting style. Back squat develops strength in the front squat more than front squatting does, so that should tell you which one you should focus on. Do back squats twice a week and front squats once a week.
Fruant squats developes your back squats too. I've done only front squats, but my back squat is always about 25% better than front squats, when I've tried it. So if I do front squat 90kg 5x5, I can easily do back squats with 110kg 5x5. That whats I've found.
I think front squats are much better for explosive power and better for any combat sport. Back squats are so hard to do with an explosive technique and most athletes tend to do them slow.
I'm certain that back squats are really necessary for boxing. I'm not sure the onus should be on strength per se, but in functional movement, in which strength is a by product. I believe the strength and conditioning coach for the Seattle Seahawks is a "movement" guy, and he's done pretty well. Additionally, the former coach of the Atlanta Falcons was also classified as a "movement" coach, but his team had minimal injuries. Furthermore, when the coach was replaced after several seasons, the team's injury rate skyrocketed.
Both potentially good exercises for facilitating improvements in punching power. Back squats are a more hip dominant exercise, while front squats are more quad dominant. It would be interesting to research the electrical (iEMG) activity of the muscles while throwing punches to see what muscles are most activated. I would think that the hips play a more important role in developing punch power than the quads, so back squats may be more appropriate. Would definitely have both in my programme.
If a punch is more hip dominant, then wouldn't a deadlift be more appropriate? And if you wanted to incorporate your quads more, wouldn't your best option be a trap-bar deadlift? Assuming, that's the direction you want to take. There are other ways to work both that don't involve a deadlift or a barbell squat.
Its interesting what you say about the injury problem, . Its getting noticed quite a lot these last few years, you make a good point.