at her weight, just taking a walk would be good exercise. That flailing just looks painful/risky
Walking is great for anyone. Steadily burns calories, and a LOT of calories with every mile if you are huge, the constant activity helps moves your lymph around, does your circulation good, works your heart but not enough to cause a heart attack if you are huge and unfit. Less stress on the joints than running. Far less risk of trips and falls, splints and sprains and other shit that has you laid up for weeks too, especially if you are far and unwieldy and will go down HARD if you trip on a kerb or whatever. Same with these jumping exercises Anna likes to be seen doing. One slip and she's down and probably can't get back up and has a broken wrist or sprained ankle/wrenched shoulder into the bargain.
But of course this is Anna, and the whole cult of fitness instagrammers has produced a weird cargo cult mentality around fitness, based on what you wear, eat and are seen doing, the more complex the better, even if it's totally useless. So Anna girds on a pink fancy exercise outfit, and does an entirely useless exercise once for the camera and hey presto, fat AND fit!
Seriously, wtf is she trying to squat? Pointless. Her lower half is taxed enough simply holding her weight up day in day out, and it burns precisely fuck all calories compared to say, walking a mile or two. Anna needs to control her calorie intake and just walk, not fuck around playing at fitnessgrammer.