Rules to play Yo Yo
The yo yo intermittent test was developed specifically for soccer players, though it is suitable for similar sports teams which are intermittent in nature. The level 1 test is designed for recreational level players, while the level 2 test is for elite soccer players. The test is not suitable for populations in which a maximal exercise test would be contraindicated.
reliability: Test reliability would depend on how strictly the test is run, and the previous practice allowed for the subjects.