Well rach, theres a machine that you sit upright on and you put your arms under a sorted bar thing and back up and you hold onto arm things at the side of your face, does that make sense? then you sorta do tummy crunches by leaning forward and then sitting back upright.
Thats good.
theres also one you sit on a down angle with your feet against a wall and push yourself up and down(youl like that hawhaw

) and you adjust the amount of weights you want to take with you