Objectives To examine the reliability, validity, and usefulness of the My Jump 2 application compared to an infrared platform photoelectric cell system in young and adult professional athletes. Equipment and methods Twenty-one junior athletes (16.0 ± 1.8 years old) and nineteen professional adults (20.7 ± 7.7 years old) performed six countermovement jumps (CMJ) and six squat jumps (SJ) measured simultaneously by the optical jump device (infrared platform) and the My Jump 2 application. Results The results revealed very high correlations between the My Jump 2 application and the infrared platform photoelectric cell system for both SJ (r = 0.99, P < 0.001) and CMJ (r = 0.99, P < 0.001). Furthermore, high reproducibility (ICC > 0.86) and low coefficients of variation (CV < 5%) were observed for all measurements. Conclusion My Jump 2 application presents excellent validity, reliability, and applicability for SJ and CMJ jump assessments in both young male athletes and professional adults.
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