Carter is active in sports, including water sports, soccer, golf, baseball, football and motocross bike racing. He is also an avid basketball player; he plays basketball with his tour mates, and has been known to shoot baskets on stage during his concerts. He collaborated with athlete Shaquille O’Neal for the music video to “That’s How I Beat Shaq”. In January 2005, he joined brother Nick in Whittier, California and played a game with the Hollywood Knights celebrity basketball team, raising money for local Los Angeles schools.
In addition to sports, Carter enjoys working out. At the age of fourteen, he took up weightlifting and boosted his body weight from 120 lb to 140 lb. He bulked up mainly in his arms, abdomen and chest. He is also a gymnast, and he frequently performs back flips, handstands, and one-arm cartwheels in his concert appearances.
Carter is also a passionate advocate for the protection of the Everglades habitat in his native Florida. At the age of fifteen he appeared in a United States Coast Guard video promoting the use of life jackets among boaters and anglers.