What are some great cardio/aerobic exercises?

Here....let me fix that for you...

Shoveling snow from my driveway. Great workout for the boy.

Remember those days when you still had a conscripted labor pool to fall back on? I know I'm gonna miss that laborer..err...son...of mine once he graduates high school any goes out into the world.
 
You could try to find an exercise video you like. I like the P90X Kenpo Kickboxing video. It really gets the heart rate going.
 
I agree, I'm originally from Minnesota and I guarantee there are 10,000+ lakes you can skate on this weekend! Bring extra pair socks, it Damn cold now! Be careful your beer will freeze!!!
Ice skating.

Even just skating at a public skate can be a great way to get in some good cardio.
To Bob's point, I would stick with ice and stay away from inline-skating. I've banged up my knees several times, and ice gives me no issues, but with inline skates you feel the impact everytime your foot goes down, whereas the ice seems to cushion it a lot.
 
Back
Top Bottom