They try to take out your stamina by forcing you to block/escape skill, so you have to do the same, go a little offensive and force them to throw you back with an escape skill, once your enemy is low on stamina you take the fight full offensive. Or another way is to be offensive throughout the whole fight, Namekian's have great defense(coupled with a lot of health and you have a tank like a Majin Male) so take a couple hits and dish out as much as you can.