I really do not like this boxing stuff but I suppose there may be a means to an end in that ...
.. It releases

aggression (semi-passively)
.. It brings Jason back so

can deal with those demons (prison abuse/Jason/Gordon)
.. Shows

has his anger under control
.. Gets

involved so progressing Robron (we hope)
Then again it could just be another drone of a lame story that goes nowhere.
Couple of other things,
Aaron did look reflective after his chat with Adam in the locker room - was that reflective on his own marriage break-up?
Aaron looked happy, we need to see him having moments when he is struggling and I don't think we have seen that yet?
Finally, I love Robron but I do not really recall seeing a period of them being happy and together of a longer period, we know (are told) they are the loves of each others lives but ED have not given us that in terms of a sustained and visible happy, loving relationship and when they do it lasts 24 hours and then something horrid happens so any sustained visuals are destroyed quickly.