In a perfect world, there would be one workout that you could do all of the time and still see results and never get bored. In reality, your wants and needs are always changing, as is the space and equipment you have access to and the time you have to spend. Plus, to continue improving and stay motivated, you need an arsenal of routines at your disposal. They're here. We asked Aaron Guy and Derek Jameson, trainers at the new The Phoenix Effect gym in Los Angeles, to create these effective circuits. The routines provide fresh ways to get in a great workout — no matter what kind of time you have, or place and tools you're working with.