I think that sweat is a good thing! I used to be one of those folk that hated to sweat. Now, I love it. It makes me feel like I am really doing some good.
That being said, I had to work up to my current level of intensity. For way too many years, I felt I couldn't do things at a high level, so I did nothing at all. I owe my current success, AND being able to really re-shape my body, to starting with very moderate exercise - walking mostly. I slowly added in weights, then yoga, then aerobic dance, then pilates, and then the Wii.
I continue to challenge myself, by adding in heavier weights, or more reps. I can only do 18 regular pushups, but that is 18 more than when I started.
I think that exercising to meet your goals is the key. Different goals require different levels of intensity
Do you want to maintain or increase your fitness level?
Do you want to reshape/sculpt certain areas of your body?
Is exercise part of a weight loss plan? (are you counting on burning xxx calories per day?)
I've seen way too many folk start an aggressive plan and give up quickly. It burns them out, they suffer an injury from going to far to fast, or they just get bored or hate every minute of it.
I think (like with everything else) it is a balancing act for most of us. We learn what works for us through trial and error. Jay is really successful going to a gym and working out. That doesn't work for me at all. But both of us are successful because we have found what DOES work and what we can continue doing for the long haul.
My, I'm preachy today, aren't I?

off
On a lighter note and long story short - I'm looking for a used tuba/euphonium. If anyone hears of one becoming available ...
Gotta fly - way too much to do today. I spent the morning doing our taxes and the FAFSA for DS2. Very happy that is DONE, but it has put me way behind schedule!
Hope you all have a productive/fun weekend!
Laurie