hey i lift 4 days a week and i have no problem getting good results in the gym. but i dont do cardio b/c im trying to
gain weight right now. i eat every 3 hours and take protein and eat healthy. but i recently got interested in boxing and i have looked at some heavy bags and speed bags. but i know how much of a workout hitting a bag can be and i dont want to do anything to mess up me
gaining weight since it is going so well right now. my main goal to box right now would be to be able to hit harder (for fights or whatever the reason

) but later when im cutting weight maybe do some cardio on it. would this be a good idea to get a heavey bag and hit it to be able to hit harder or even make my arms stronger and maybe bigger. if so what kind of hitting excersizes should i do and how often. i was told that since i lift heavy i shouldnt box heavy b/c it would overtrain. i do not know what to do so any advice will help. thanks