Appnaerobic is based in the Conconi test, which has been proved as the best non intrusive test to calculate your anaerobic threshold.
Take the first step for a custom training, download it now.
You only need your heart rate monitor to perform the test, so put it on and let's see how far your limits are.
Don't you have a heart rate monitor yet?
This may be interesting for you.
Your results depend on your shape. Keep the app and perform the test each month.
It's not going to be easy but it will be worth.