Bruce Protocol

This is the standard medical test for caridac endurance.  This is done on a treadmill. 

STAGETIMIING (3 minutes each)SPEED (Miles Per Hour)GRADE
10-3 Minutes1.710%
23-6 minutes2.512%
36-9 minutes3.414%
49-12 minutes4.216%

Stop if any chest pain, dizziness, or fatigue and inform the doctor.  If you can make it through the full 12 minutes you have excellent cardiac endurance!