rtorres25 I've found that while there definitely is a difference, the fitness does crossover, mostly. It partially depends on what kind of treadmill you use. I dont think I would want to run in super high heat/humidity, or extreme cold, so I dont. (although I used to train horses in EXTREME conditions every day- it didnt bother me) I kind of figure that some type of fitness is better than no fitness at all! I do ocassionally run outside when the weather is nice, and it hasnt been a problem, might be different for others though. I have also found that a treadmill is a lot easier on my joints AND when the kids are home, I can keep an eye on them or answer HW questions, still do my nebbie, and run. Multitasking at its very best : )
If you want it rhonda, go after it the best you can : )