The average person, or at least average person using this website, sites in front of a computer all day or in a similar pose. If you're doing labour like construction work, stocking shelves, or cleaning, you're mostly bending to pick stuff up, and if you're in a crouch or bent over position, your neck is probably still craned to keep your gaze up.
So, any pose that can reverse that gives your body a much needed break. Even slowly bending over in a "touch your toes" shape and letting your upper body, head, and arms hang down is very good for you. If someone is feeling stiff or gross, doing that a few times a day can make a surprisingly big difference.
Here's the thing, though: you don't actually have to touch your toes. You don't "succeed" in yoga by already being flexible. Yoga is the practice of doing those poses and motions to build up strength, etc. So just hanging as far as gravity will pull you to give your back and legs a stretch, without overdoing it, and taking the strain of your head off your neck for a while is fine. Do that once or twice a day and most people would be able to touch their toes in a surprisingly short amount of time.
A lot of deathfats can't touch their toes, though. And they might not even really be able to bend over that far. If they can go far enough that their head and arms hang, then they are getting a benefit-- it just LOOKS very underwhelming, and probably makes them feel bad and sloppy. If they have their head on right, they accept this. I know one very fat person who has been fat her whole life, and she does yoga all the time, and she accepts this. She does the version of the poses that she can do, and she focuses on the benefits she gets from it rather than trying to achieve the advanced forms.
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@Autisticats mentioned, there are LOTS of GREAT resources for fat people who want to do yoga. The best among them, however, don't have that great aesthetic that internet influencer types are looking for. A fat person doing yoga is just never going to look as good as a hot, skinny yoga influencer doing crazy inversions and bends on a beach or on top of a mountain or wherever. So it really depends on what someone is looking for, and what they want to get out of it.
PL time: The more I think about this head-stand prop she's using, the more I get mad at it. I can see a few beneficial reasons for using a prop like this, but not many. I don't see at all how it's preferable to doing a headstand in front of a wall. Maybe I'm biased because that's the way I was taught to do it when you're starting out, and it took me about a year to be comfortable trying it away from the wall. It's been a few years years and I still don't have the ab strength to do a complete controlled head-stand without kicking up. (If I practiced every day, that would be a different story.) So I usually do it by the wall and kick up to get into the pose and get the benefits for my neck.
I was also taught to balance on my forearms, using the top of my head on the floor as a sort of reference point. Thinking about it now, it's much easier to "fall" out of position that way. Besides having the wall as a balance, if you fall, you already have more contact with the floor, and can sort of push away so you can land on your feet. I think it's also less likely that you might fall to the side. You already ARE the support on the ground, rather than using the prop.
In this thing, if she falls backwards, she's fucked. If she's very body-aware, she might be able to catch the wall in time, but she looks a bit too far away. She'd twist backward over her neck. If she wobbles to the side, she's similarly fucked, I don't really see how she'd get out of it in time. The only safe way she can go is the way she got in, and it's hard to believe she has that much control.
Props, while very useful to accommodate certain moves, can also be kind of a crutch. They can make people think they can go for poses they're not ready for. Teachers will often say, if you can't reach floor, you can use a block to make the floor higher for you. That's great. But sometimes a very good teacher will say "If you can't reach the floor or block, it's enough to just reach FOR it" and I think that's something people often forget in yoga.
I'm probably also making it sound like injuries are more common than they are. Yoga is pretty safe. I just worry that if some very fat people see something like this online, especially if they are not getting yoga instruction in person from a qualified teacher, and they do wind up hurting themselves, it'll derail their health even more. I've seen very fit, athletic people pack on the pounds after an injury. And I don't think a deathfat needs a lot of excuses to quit yoga. So I just hope they find the right resources to do it.