Remember to Rest
Yep, rest is also important. After a VO2 max activity, you need to give your heart – and the rest of your body – time to cool off for a bit. This will get you prepped for the next round. How much time can vary, but at least a few minutes is a good idea. When you’re really hitting your VO2 max regularly, you may want to go for a 2:1 ratio for your recovery period: make sure it’s at least twice as long as your activity took.