Dancers in both conditions performed choreographed routines before and after the 12-week training period. Dancers were rated by professional dance instructors on posture and alignment, use of upper body and arms, lower body and feet, total body coordination, and presentation of movement.
Before training, dancers in each group displayed equivalent abilities. After 12 weeks, dancers who participated in the aerobic and strength training program were rated higher (a difference of more than 2 standard deviations or 30 points) on dance ability than those in the control group. Based on these findings, it can be concluded that 3 months of fitness training can be beneficial to dancers and that dance performance does not suffer as a result of strength training.
Source: Koutedakis, Y., Hukam, H., Metsios, G., Nevill, A., Giakas, G., Jamurtas, A., and Myszkewycz, L. (2007). The effects of three months of aerobic and strength training on selected performance- and fitness-related parameters in modern dance students. Journal of Strength and Conditioning Research, 21(3), 808-812.