In the days before our own a Guild of Thieves had high standards. To join you'd have to be fit, fast, agile, tireless. Capable of great stealth and, when called upon, great speed and physical power. Thief is the kind of workout you'd do when you'd be preparing. In our more enlightened days we no longer need thieves or their Guilds, but fitness, agility, strength, power and endurance are still important. So, here you are. Add EC.
Extra Credit: 1 minute rest between sets.