I work at a Juvenile Center and just took the boys in the weight room tonight. Usually I lift weights with them, but tonight I decided to run on the treadmill. I did a 30 second sprint followed by a 2 minute fast walk/jog (on an incline, with pretty good resistance) for about 20 minutes. I was dying afterwards. It's amazing how a different form of cardio can kill you.
I can do an 45 minutes of advanced step aerobics or intervals, but 20 minutes of the treadmill workout and I was dying.:+ I realize I need to challenge myself aerobically now. I am going to do this again next Saturday and see if I can go 30 minutes straight. I did rest awhile and did another 10 minutes and for some reason it got a little easier. I can really feel it in my hamstrings. At first when I started, I got that burn in my chest and all I could think is "I can't be this aerobically out of shape!" To say the least I am so sweaty my co-workers are a bit grossed out by my appearance. But it sure feels good!}(