I think they swell up because blood is not flowing well. If you sit for a long time or where you setted is not comfortable for you lower body part, your blood start not flowing well and not reaching the feet you start swelling!
To properly hold your feet down while doing sit-ups, you can anchor them under a heavy object or have a partner hold them for you. This will help stabilize your lower body and prevent your feet from lifting off the ground during the exercise.
Blood goes down to your feet all the time, but the muscles movement prevents it from just sitting around in your feet. During a flight, because you sit around for many hours, the blood just stays in your feet, resulting in there swelling up.
1 Get a Capri Sun Pouch 2 Blow it up 3 Place The blown up pouch under a friends but 4 as the person is about to sit down distract the friend while He's about to sit down make sure to do it while He's about to sit down 5 he sits down on the pouch 6 Your Hands and feet are replaced with Whoopee Cushions
Need stretching
sit down for a bit and massage your feet abit and keep your feet cool
cos they do
Ex: Please sit down for a while. The phrase “down for a while” is a prepositional phrase. With down & for being the prepositions & while being the object of the preposition.
Your horse can't stand your weight, so he sits down while u ride
You must stay on your feet, if you sit down you go right back up.
If you mean the stretch you: sit down on the ground and pull your feet up to your crotch and stretch:)
The image is of you "taking a load off" of your feet, which are holding you up. If you take a load off your feet, you'd sit down. This is most commonly used as an invitation to sit, as in "Come on in, take a load off."