And knows fuck all about weightloss - any additional movement increases both the energy expended and, by gradually increasing muscle, the BMR. Organisations such as Versus Arthritis offer free chair exercise programmes, accessible to anybody who has a phone; all you have to do is sit down and hold off spitting venom on social media for ten minutes. It also enables them to control the level of exertion and range of motion so that injuries are less likely. Even sitting there and moving your toes/hands and tightening/relaxing your abdominal muscles is still exercise.
I should know. It's how I started post Covid/last flare when I had been exhausted, heart pounding and gasping for breath after doing a whole 63 steps per day. About 45 of those 63 steps were deliberate exercise, as I had switched from using the downstairs bathroom to making myself go upstairs for a pee to make a start on it. I wasn't even strong enough to get in and out of the bath at the time and relied upon Mr D to wash my hair ( just having to hold my head in position for him to do that was exhausting). Only after I'd been doing that for a long time was I able to think about what I ate in relation to activity levels; I was putting weight on at very low calorie intakes precisely because I wasn't moving.
It's taken a long time and I was able to put some money into it eventually when I got a new job, but the biggest leap was from those first steps and movements, as they started the process.
There's no expense involved in tightening your abdominal muscles, wiggling your toes every so often or possibly standing at the bannister and moving your arms a bit during the day. And that's how many people actually need to start; not at an average Parkrun 5K starter pace with all the kit and a Fitbit.