Under robots jumping?
Between robots legs moving?
Brute robots? I thought that their torsos would've been out of reach.
'Viewing post in Sliding?
You can just normally walk/jetpack a jumping robot.
Unless you turn into like a ball kind of thing in metroid, I'm pretty sure the body can't slide between the robot legs.
It is a good idea though. Maybe instead of sliding, there can be a sliding kick. It can be activated while kicking during a boost/jetpack thingy.