i have been told to chop and change what excersise i do at lesst every 12 weeks, as your body gets used to one form of excersise then the effect wears off, so for 3 months i swim, then i dance as well as swim, i then walk and dance, (i do tap and jazz).
thats been my main secret as my body is no longer benifiting from just dancing alone so i rotate my dance classes with additional excercises such as swimming, walking or boxing
i wont say its easy and i still dont totally love excersise lol but it works