I just dont have it in me to run anymore, i dont have the lungs or stamina for it due to ashma and i can maintain a steady cardio routine, although i can use the eliptical for 30 mins 5 days a week no problem. its obviously not the same intensity but is it still effective? i usually burn about 350 calories in a 30 min period on the eliptical.
What's up with your asthma? Are you treating it?
Steady cardio is for the birds. I mean it. If you can fly, then please continue, because your life will depend on it, lest you poop out and come crashing to the ground. But I don't think you have wings.
Where did you receive the info about 350 calories in 30 minutes?
If it's from the machine you can toss that info. It's generalized and can vary by as much as 25%
I'm a little biased because I prefer training in the upper intensity of one's cardiovascular system. Give me 15 minutes of huffing, puffing, gasping for air, rather than 30 minutes of staring off into the TVs hanging from the ceiling or texting buds.
Your asthma will be the limiting factor here though. If it's not controlled well then this is a great way to end up needing medical attention.
Here's what I'd do if you were a client who wanted to do something different.
5 minutes of jump rope
500m on the row machine
50 jumping jacks
40 cross country (40 on each side)
30 bodyweight squats
20 pushups
10 mountain climbers (10 on each side)
5 minutes of jump rope
500m on the row machine
Now, first of all, I hardly think you'll be able to jump rope for more than a few minutes when you first start this. It sounds easy until you start doing it. I have only a handful of clients who can go for five minutes, and they usually need a few minutes to rest before jumping into something else.
But for no more than 10 bucks (never spend more on a fancier gimmicky rope) you can have a killer cardio workout that is strengthening your calves like crazy. Not to mention you'll look cool when you can do double unders and crossovers.
If you can actually complete the entire workout above it will probably take about 30 minutes the first time, and eventually you can get it down to 20. Once you get it down to 20 you'll notice two things.
1) You'll be getting very vascular and leaner - in a way that jogging on the DREADmill won't accomplish.
2) You'll need significantly less time between your heavy lifting sets. Your body will become more conditioned and that 3 minutes of rest will turn into 2, sometimes even 60 seconds. It's amazing what happens when we give our mitochondria a reason to get off their little cellular asses and do some high intensity work. If you're like me, you'll even feel like you're cheating on heavy days, because it will be a breeze - not to say it won't be heavy and heavy sucks, but you won't be wiped out.
Hope that helps...