A higher VO2max means that your body is better at taking oxygen from the air and delivering it to your muscles. The more oxygen your muscles can get, the more nutrients you can aerobically transform into the molecular fuel (ATP) that your muscles use to contract and perform.

What is a good VO2max by age?

Classification18-2556-65Excellent>60>41Good52-6036-41Above average47-5132-35Average42-4630-31

What is a good VO2max on Apple Watch?

Apple Watch supports a VO2 max range of 14-60 mL/kg/min that is validated for users 20 years or older.