Singh, Satya Prakash. “A Comparative Study of Physical Fitness Levels: Administration and Analysis of Endurance, Leg Strength, Speed, and Agility Tests in Sportsmen and Non-Sportsmen”. International Journal of Science and Social Science Research, vol. 2, no. 3, Dec. 2024, pp. 288-92, https://doi.org/10.63671/ijsssr.v2i3.158.