What's the true indication of being in great shape? I was spending many nights just like you wondering that same question. Then I went to Pro Sports Club where they were testing athletes and members for their VO2 Max. Your VO2 Max is a great indicator of the shape you are in. Lance Armstrong is known for being a bit of a superfreak and having an incredibly high VO2 Max. I wanted to check out the technology behind this test for myself.