1h before hand should be fine so long as it's an actual 1hr break and not more like 20-30mins. You'll want to refeed on some protein and non-sugar carbs of course, get your electrolytes back up. Keep
I would stick with 10-5-5RM extension, I would probably do the latter portion for 4 weeks, maybe 6. You will want the heavy weights to maintain muscle as best you can whilst boxing. Trying to bulk is probably going to be a stretch, but then again, with enough food it's not impossible
. Don't be a hero and try to PR. You're unlikely to put much muscle on at a fast rate, hell, I would expect the first cycle to be a cut even if you don't intend it.
Definitely no boxing during SD.
I would keep the volume to 2 sets. It depends how fresh you want to be your sessions. Your body will learn to endure and become better at the managing the extra exercise, having said that, the first week or so might be a bit killer
Exercises:
-Boxing is obviously all power from the legs, glutes (hips). I would include squats & leg curls (deadlifts will just wreck you, IMO). I don't think you'll need extra leg raises necessarily but some people like the extra quad work. I would focus on strict squat form and definitely make sure it's ass-to-ground.
-Chins/pull and rows are fine. Your lower back will take care of itself I dare say.
-Chest-wise, go with whichever exercise is most comfortable. Preferably a BB or dips, as the extra stabiliser work might just tire you out.
-Shoulders are a must. It's
because of their importance that I would absolutely include them. I wouldn't do DB's again for same reason as before; too much energy spent stabilising. Military Press or a machine would be just fine here. I would probably do lateral raises as well. Stick to using your 10RM and then
strict 5-6RM. No need to increment. It's to keep them under strain and help build your endurance. Nice and slow rep speed is what I prefer.
You won't need triceps work at all obviously, the CNS strain will just hold you back IMO. Biceps will get enough via chins, and you obviously use them and your lats to whip your arms back (retract) when jabbing or a non-over committed cross.
General note: 2 sets for the first cycle, probably go to 3 sets for the 2nd - in 3mths time etc