Data analysis
SECONDARY
SPSS 26.0 software (IBM SPSS, Armonk, NY, USA) was used for statistical analysis. Descriptive statistics were presented as mean ± standard deviations. The normality of all outcomes was tested using Shapiro-Wilk tests. Independent t-tests and chi-square tests were used to compare the baselines between the two groups. The primary outcomes were analyzed by a multivariate ANOVA (MANOVA) to control the overall type I error. The secondary outcomes were analyzed by two-way (group by pre-/posttest) ANOVAs with repeated measures between the two groups before and after the stretching. If significant interactions were detected, the post-hoc tests were followed with the Bonferroni adjustments. Because of the potential for type I error due to multiple comparisons, findings of secondary outcomes should be interpreted as exploratory. Partial eta squared (η