Those are medical dummies. Look at the legs and feet propped on the pillow. The feet are staying at a 90 degree angle. Lay down yourself like that and relax - have someone take a picture of your legs and feet. They will be around a 105 to 120 degree angle - and your legs will sink into the pillow more than that. Not even the best medical dummies ….
https://metro.co.uk/2016/09/30/this-life-like-medical-dummy-comes-complete-with-internal-organs-6162594/