I've got rickety knees so this is very appealing. I gave up running when I was 19 after bits of cartilage began working themselves loose and have been cycling since, but now that's starting to aggravate the joints.
Pilates is fantastic for the core and I'm doing things in that studio that 18yo me could only have dreamed of, but it doesn't get the heart pumping.
The intermittent fasting experiment is a good one. I played with the 5-2 but found the fast days drove me to distraction and any gains would be obliterated the next day. I've since taken on a similar approach to cyclopath, at least during the week, where dinner is followed by lunch at midday.
Re. booze, it's so intrinsically tied to my social networks that going cold turkey is frankly frightening. But I'm trying to avoid Friday drinks and limit the number of silly blowouts throughout the year.
Every so often I keep a food diary to just check macros & calories, for me intermittent fasting led to blow outs in calories later in the day, so a couple of eggs and a small pork. lamb or beef steak for breakfast keeps me satiated and not looking for food. I plan to have 225gms of good complete protein a day (that equates to 500gms of beef) and I notice my workouts suffer if I don't at least keep that up or exceed it