The mean (SD) of the static trunk strength, U/E strength, and seated reaching distance outcome measures as well as the MWPT outcome measures are summarized in Table 2. The correlation coefficients between the static trunk strength, U/E strength, and seated reaching test outcome measures and the performance-based timed MWPTs are summarized in Table 3. In terms of the strength-generating capability of the individual trunk muscle groups, the anterior and left lateral flexors presented a good association with the 20 m MWPTMAX, whereas only the left lateral flexors presented a good association with the MWPTSLALOM. As for the contribution of the strength-generating capability of the individual U/E muscle groups assessed on both the strongest and the weakest sides, five, six, and seven muscles groups on the strongest side and six, eight, and six muscles groups on the weakest side were found to be very good or good predictors of the 20 m MWPTMAX, MWPTSLALOM, and the MWPT6 min, respectively. However, only poor, fair, or moderate associations were revealed between the various U/E muscle groups assessed and the 20 m MWPTNAT. As for the seated reaching tests, only the forward reaching test showed a very good association with the 20 m MWPTMAX, MWPTSLALOM, and MWPT6 min. The best predictors selected by the regression model for each MWPT are summarized in Table 4. A total of 14, 16, and 14 determinants (i.e., possible predictor variables) were entered into the predictive modelling process for the 20 m MWPTMAX, MWPTSLALOM, and the MWPT6 min, respectively. The strength-generating capability of the shoulder adductors on the weakest side was the main predictor of the 20 m MWPTMAX, whereas the strength-generating capability of the shoulder adductors on the strongest side as well as the forward seated reaching test were the main predictors of the MWPTSLALOM. Although these two predictors are not completely independent, no severe collinearity problem was revealed (VIF = 1.9). As for the MWPT6 min, the best predictor was handgrip strength on the strongest side.