Welcome Beaches,
Pleasure to meet another water baby. I relate to the addiction of swimming, I was an 80 lap a day girl for many years. Now I surf just constantly, yes the ocean is the best healer and I love how it brings you into the moment, no thoughts for anything else but the sea, and the rhythms of the body in it.
I surf on tx, in fact I surfed yesterday...The tx regime seems to have varying sx during it's course as Gaj pointed out there is a euphoria initially; in my case the first month of my 12 weeks sof/led I had migraine despite constant hydration, so took it easy but yes still surfed when I felt up for it, and I do TM, the second four weeks were easy, some tummy grumbles which are best sorted with water sport defs, and now at almost week 10 have insomnia but am surfing around three times a week....fatigue is starting on and off, I just slept all Saturday daytime,t'was a good catch up day.
I have done peginf/riba which is disgustingly debilitating so this tx is very easy in relation to that.
I think it is all relative, and all about mindset, and all about the individual. You are used to pushing yourself to sport and yoga and so am I with surfing and TM. I just do it.
One thing I note is a heightened sense of speed, I get it driving too, not particularly pleasant, it can create confusion so I drive around twenty Kms/hr lower than the recommended, much to the disgust of other motorists.
Re sport, I am very aware not to go too crazy for the adrenaline I usually crave. Choosing smaller days, although yesterday I paddled a reasonably solid swell, I will attach pix the magical beauty of my waves, I am at near end of treatment and find I am loosening up my self protective streak.
Re sides being very individual, I also had some BP issues during the middle section of tx, Pat1 has started a good thread about that sx, not everyone gets this but I was surprised to find out mid tx, and was helped by Dr J, and it is sorted...so that is an example of the individual nature of sx people report. In the forum here you can search issues and also check in Experts Corner for side effects etc. however, overall I think this tx is very mild and I just go with the flow mermaid style.
I hope this info about my lifestyle helps with your query, but the main thing is good luck for your tx, keep chatting, this is a very supportive and useful forum
Splashes from Ariel