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Methods| After ethical approval from the Comité d’Ethique hospitalo-facultaire at Cliniques universitaires St-Luc, registration (NCT03670511), and written informed consent were provided, healthy children aged 8 to 18 years were recruited. The only inclusion criterion was participation in the mandatory medical investigation at school. The exclusion criteria were a diagnosis of chronic lung, cardiac, or neuromuscular disease, motor disability, or being overweight. Children performed 2 1-minute STSTs4 (STST1 and STST2) with a 1-week interval. Concomitantly to STST1, children performed a 6MWT as a reference test. 2 The number of sit-tostands, walked distance, HR, and HR response (ΔHR initial to final [if] and ΔHR final to rest [fr]) during the test were recorded. The STST concurrent validity (association with the 6MWT), inter-STST agreement (Cohen κ), reliability (intraclass correlation coefficient [ICC]), and …