setting up your pedals with proper retention also helps a whole lot. if you're into clips & straps, nicer straps or doubles make your feet more connected. you could also try out powergrips, which are almost as good as a cinched-down strap setup but easier to exit if you need to.

just focus on making circles with your feet, but not applying power. the resistance provided by your legs will check your spin unless you have a really low gear.