This study aimed to determine the development of cardiovascular endurance and leg power through TAEBO among high school athletes of Trinidad V. Canja-Sta. Teresa National High School during the school year 2007-2008. This quasi-experimental investigation employed the pretest-posttest design for determining the improvement on cardiovascular endurance and leg power among high school athletes through TAEBO. Twenty (20) athletes were paired based on level of their cardiovascular endurance and leg power, gender and sports participation. Harvard Step Test (Prentice, 1991) was used to determine the pre- and post-cardiovascular endurance, and vertical jump (Davis et al., 1995) was utilized for determining the leg power of the participants. Results were interpreted using the mean, standard deviation and t-test at .05 alpha level. The results showed that the pre-experimental level of cardiovascular endurance of the athletes under study was “poor”. The pre-experimental leg power of the participants was “average”. The post-experimental level of the cardiovascular endurance of the TAEBO group was “good” while without TAEBO was “fair”. There was a significant development in the cardiovascular endurance of the participants under study. There was also significant development in the leg power of participants under study. There wassignificant difference in the post-experimental cardiovascular endurance of the athletes but no significant difference was found in the post-experimental leg power of the athletes.