Cardio, Again.

I know I posted a thread about this a little while ago but I can't seem to find it.

In that previous thread I said I wanted to work on my cardio, not for weight loss but for more cardio endurance and stamina. I don't have a gym membership yet and it's getting cold outside where I live and I don't exactly want to go run outside in the snow to train.

Members suggested that I run up and down the stairs and or do jumping rope. I tried the stairs a little bit but I almost face planted like 3 times haha.. and I feel it doesn't work too well as an exercise. I tried jumping rope but I can't seem to get the most of it? I can go for like 12 minutes but then I stop, not because I'm burned but because my arms and legs give out and then I have a sloppy form.

My grandmother bought a stationary bike a while ago, she never used it and she's ready to lend it to me so I can train on it, however I think I read a thread on here last year where someone said that treadmills and stationary bikes are not efficient for a good/effective cardio training? Should jump on the chance or what? Inputs/suggestions please

My 5x5s as of November 2nd 2008.
Squat 155lbs
Bench 155lbs
Deadlift 155lbs

Connelly's 5x5s as November 2nd 2008
Bench 115
Squat 145
Deadlift 165

Andy11's 5x5 as November 2nd 2008
Bench 150
Squat 150
Deadlift 175

Haha, wow that signature is old.

They aren't useless, but if I were you, I would just suck it up and go outside. If you put some sweatpants and a coat on, you should be fine, especially once you get warmed up.

Goals by end of 2009:
Bench 205
Squat 255 ATG
Squat Clean 185

"There is no elevator to success, you must take the stairs."