Yes it's quite important to use bio on gym kit and martial arts uniforms...
If you've got a really bad patch under the arms make a paste from bicarb and water and put it on and leave overnight before washing in a full dose of bio.
DO NOT wash at 60 as this will fix them smells - make sure you always wash them cold which allows the bio properly too...
You can also soak in bio before you wash too
I recommend Ariel Bio - the green one