iron gym pull up bar

[Chriskavouris]

i know pullups is for back , chinups is for biceps, and dips r for triceps. on this pullup bar but theres the lay down push up positiion . theres 2 ones the far grip pushup and the push up with ur thumbs pointing up doing the push ups. wat do these 2 pushups positions workout ?

i wanna get toned n in shape wit some light dumbells once in a while an d i know a pullup bar can greatly benefit. but i wanna kno wat these push up positions workout thanks.