Sweating used to be my number one excuse for not exercising. However, at 28 years old I was placed on medicine for high blood pressure so it was time to give in and break a sweat.
I joined a gym and do the treadmill, and do some free weights. I also play ping pong (think Forest Gump....) and believe it or not, break a sweat. On Sundays I make myself get out and do something outdoors; usually walking in a park.
The gym I attend does all kinds of classes like fencing, karate, tai chi, and many more so I will probably join one of those when the weather gets too hot and humid to go outside.
I hope these basic ideas inspire you.