## 3 Results
### Inter-Individual Variability (Rs vs. NRs)  
Table 4 provides a detailed comparison of performance changes for the novice and advanced groups. It focuses on the mean differences between pre- and post-test scores, along with the percentage of participants who responded positively to the training (responders) and the effect size (Eta squared, \(\eta^{2}\)) for each variable. The analysis of inter-individual variability of body weight, BMI, fat mass, and fat-free mass, showing Rs only in the advanced group, where there was an Rs for BMI (n = 1; 9%; 0.03), fat mass (n = 1; 9%; 0.19), and fat-free mass (n = 1; 9%; 0.22). The novice group did not present any individual response in the morphological variables. The novice group presented Rs in back squat (n = 4; 40%; \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Variables**} & \multicolumn{2}{c}{**Novice Group (n = 10)**} & \multicolumn{2}{c}{**Advanced Group (n = 11)**} & \multirow{2}{*}{**Group by Time**} \\ \cline{2-2} \cline{5-6}  & **Pre-Test** & **Post-Test** & **Pre-Test** & **Post-Test** & **Interaction** \\ \hline Body weight (kg) a & 66.64 \(\pm\) 10.47 & 66.19 \(\pm\) 10.76 & 69.51 \(\pm\) 5.43 & 69.86 \(\pm\) 6.40 & F\({}_{(1,8)}=1.302\); \(p=0.2868\) \\ Bipedal height (m) & 1.646 \(\pm\) 0.067 & 1.646 \(\pm\) 0.067 & 1.687 \(\pm\) 0.056 & 1.687 \(\pm\) 0.056 & F\({}_{(1,8)}=6.714\); \(p>0.9999\) \\ BMI (kg/m\({}^{2}\)) & 24.46 \(\pm\) 2.28 & 24.28 \(\pm\) 2.37 & 24.41 \(\pm\) 1.47 & 24.52 \(\pm\) 1.89 & F\({}_{(1,8)}=1.328\); \(p=0.2824\) \\ Fat mass (\%) b,c & 32.45 \(\pm\) 4.56 & 31.20 \(\pm\) 4.40 & 27.27 \(\pm\) 3.76 & 25.15 \(\pm\) 3.80 & F\({}_{(1,8)}=0.329\); \(p=0.5822\) \\ Free-fat mass (\%) d & 40.63 \(\pm\) 4.04 & 41.57 \(\pm\) 3.88 & 44.05 \(\pm\) 3.27 & 46.35 \(\pm\) 3.24 & F\({}_{(1,8)}=0.819\); \(p=0.3918\) \\ \hline \hline \end{tabular}
\end{table} 
Table 2: Time by group interaction factor on morphological variables in novice and advanced CrossFit practitioners. \begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Variables**} & \multicolumn{2}{c}{**Novice Group (n = 10)**} & \multicolumn{2}{c}{**Advanced Group (n = 11)**} & \multirow{2}{*}{**Group \(\times\) Time**} \\ \cline{2-2} \cline{5-6}  & **Pre-Test** & **Post-Test** & **Pre-Test** & **Post-Test** & **Interaction** \\ \hline Back squat (kg) a,b,c & 61.5 \(\pm\) 19.2 & 79.6 \(\pm\) 27.78 & 96.73 \(\pm\) 20.94 & 98.91 \(\pm\) 20.79 & F\({}_{(1,8)}=6.852\); \(p=0.0308\) \\ \hline Deadlift (kg) b & 76.7 \(\pm\) 30.4 & 91.7 \(\pm\) 30.64 & 110.3 \(\pm\) 33.16 & 111.2 \(\pm\) 27.52 & F\({}_{(1,8)}=4.406\); \(p=0.690\) \\ \hline Military press (kg) a,c,d & 29.5 \(\pm\) 11.28 & 32.1 \(\pm\) 12.13 & 41.91 \(\pm\) 10.22 & 42.91 \(\pm\) 9.607 & F\({}_{(1,8)}=0.405\); \(p=0.5424\) \\ \hline CMJ (cm) & 23.9 \(\pm\) 8.535 & 25.41 \(\pm\) 8.161 & 29.42 \(\pm\) 6.924 & 28.69 \(\pm\) 5.788 & F\({}_{(1,8)}=2.596\); \(p=0.1458\) \\ \hline Sit-ups (reps) a,b,c & 28.1 \(\pm\) 6.74 & 35.0 \(\pm\) 4.397 & 34.82 \(\pm\) 4.708 & 36.45 \(\pm\) 3.83 & F\({}_{(1,8)}=4.612\); \(p=0.0640\) \\ \hline Push-ups (reps) c & 17.1 \(\pm\) 6.839 & 21.8 \(\pm\) 4.709 & 23.36 \(\pm\) 8.453 & 26.18 \(\pm\) 6.646 & F\({}_{(1,8)}=0.760\); \(p=0.4087\) \\ \hline
30 m sprint speed (s) & 6.152 \(\pm\) 0.902 & 5.897 \(\pm\) 0.928 & 5.648 \(\pm\) 0.798 & 5.404 \(\pm\) 0.608 & F\({}_{(1,8)}=0.001\); \(p=0.9717\) \\ \hline \hline \end{tabular}
\end{table} 
Table 3: Time by group interaction factor in physical fitness assessments in novice and advanced CrossFit practitioners. 0.51), deadlift (n = 2; 20%; 0.44), military press (n = 1; 10%; 0.09), CMJ (n = 1; 10%; 0.34), sit-ups (n = 3; 30%; 0.47), push-ups (n = 3; 30%; 0.50), and 30 m sprint speed (n = 1; 10%; 0.22). Concerning the advanced group, they only presented Rs in sit-ups (n = 2; 18%: 0.13), push-ups (n = 2; 18%: 0.27), and 30 m sprint speed tests (n = 1; 9%: 0.09).