How do you breath during the various phases of fighting: striking, wrestling and grappling?

Do you have some concepts to use regarding these themes? Thanks

On the fence sometimes I have difficulties in get going when I get a bodylock, I feel I do not have much strenght or stability and sometimes I cannot takedown or mat return the opponent. Basically I try to put the knee inside to hit a twisting takedown removing the opponent from the fence, if not possible I try to put the leg behind to "table" him or in front to off-balance the other way. Do you have any tips on this position, both in posture and possible follow-ups? Thank you

On the fence I noticed that many athletes are hitting consistently Harai Goshi, which is, in my opinion, a very dangerous technique to be hit with (causing knee problems). I wanted to know if, on the fence and in the open, someone has tips to defend and counter, particularly keeping the knees safe, both in training and in competition. Thank you

Sometimes I have difficulties in breaking the posture of the opponent in rear bodylock. Do you have some tactics to to that efficiently?