Figure 2. Forest plot of the effects of strength/power/speed training on XCS-specific performance. Positive values present effects in favour of the intervention group, while negative values present effects with respect to the pure endurance control group. The mean effect and its 95% confidence interval is presented as a diamond. HYP, strength training designed to increase muscle size; IC, heavy weight training designed to improve intramuscular coordination; SEP, training designed to enhance sprint endurance performance; EXP, explosive strength training; TT, time trial; DPE, double poling ergometer; TTE, time to exhaustion; DP, double poling.