What is CrossFit Teens? CrossFit Teens is a strength and conditioning class designed exclusively for teenage athletes (13-17 years old), and teenagers wanting to learn a new sport or train like an athlete. CrossFit Teens combines age-appropriate weightlifting and gymnastics with high intensity training to deliver optimal fitness and performance. We teach proper weightlifting techniques to enhance strength and power, and also focus on basic gymnastics to increase agility, mobility and flexibility. CrossFit Teens is ideal for any teenager looking to get the edge over their competitor in their chosen sporting field. In addition, it is a great way to get your teen into the habit of training and maintaining good healthy habits.