Yo-Yo Intermittent Recovery Test (level 1)_quick play - YouTube
Yo-Yo Endurance Test
Yo-Yo Intermittent Recovery Test Level 1 - Science for Sport
Normative Yo-Yo Intermittent Recovery Level 1 and Yo-Yo Intermittent Endurance Level 1 test values of boys aged 9–16 years - ScienceDirect
Yo-Yo intermittent test - Wikipedia
Yoyo Test Levels at Level
Frontiers | The Yo-Yo Intermittent Tests: A Systematic Review and Structured Compendium of Test Results | Physiology
Yo-Yo Intermittent Recovery Test Level 1 - Science for Sport
Figure 10 | The Yo-Yo Intermittent Recovery Test | SpringerLink
Normative Yo-Yo Intermittent Recovery Level 1 and Yo-Yo Intermittent Endurance Level 1 test values of boys aged 9–16years - Journal of Science and Medicine in Sport