I’m a forty-something who weighs around 215 so we’re very similar.
I used to be a competitive judoka/BJJes but now I’m too old for serious rolling with the young guys and now most of my friends are into endurance activities. I guess it’s a forties thing.
I do one sprint triathlon in the summer, occasionally two. It’s partly a social thing with my triathlete friends and partly a way to include my kids into sports - they don’t do the sprint triathlon, but often one of them bikes or runs with me during training. The older I get the more I develop a penchant for outdoor activities.
I’m not taking it seriously, I start training after the skiing season ends, usually in late April, with the sprint triathlon being in July/August. I can train year-round for the triathlon but most of the year it’s very haphazard - I run a mile after my training outdoors, do a 5k run when I feel like it, bike…
And now comes the important part of the post - I did try to prepare for a proper (olympic) triathlon six years ago with my friends and I ended up in the ER with a serious case of overtraining. The doctors couldn’t believe my CTK readings - I tried to do follow a triathlon training template with my friends and still do strength training on the side. Extremely dumb move on my part.
My advice is to be very careful - you’re old enough to know your body and when you see first signs of overtraining scale back, either strength training or endurance training. Endurance training and the accompanying rush is addictive so be careful not to get sucked up too deep.