(Business 2.0) – Jacking up workers with free Krispy Kremes and then providing massages to ease their sugar crash was once de rigueur for technology startups. Not anymore. Case in point: Infoblox, a Sunnyvale, Calif., computer networking startup that has its own tae kwon do instructor. Master Soon-Chul Kim (kneeling) holds three daily classes onsite to help employees both stay healthy and concentrate better back at their desks, explains company founder and black belt Stuart Bailey (kicking). Marketing manager Paul Levasseur says it works: "If I'm stuck and can't think, I go kick the bag and do some forms to clear my mind. I get more done."