Originally chris just played soccer. now he also dances and does martial arts and is feeling more fit, healthy, happy, and balanced. he is not training for anything specifically, but performs these activities to be active and healthy. the answer that most likely explains the change chris is feeling is from: the fitt principle of type - add another type of exercise to improve. the sport principle of tedium - involved in different activities to prevent boredom/burn out. the fitt principle of tedium - exercise for a longer amount of time to improve the fitt principle of intensity - exercise harder to improve; increase as you progress to your goals