I'm an aerobics junkie too. I would much rather jump around like an idiot than do heavy lifting. I've been heavy lifting for about 2 months now and what keeps me lifting is the results. So, buck it up, do it for several weeks, and you might just be that way too.
Of course, that being said, I went to do Max Intensity Strength this morning. Got the family room all set up, got my weights and step out, and then sat down and stared at the stuff in front of me thinking, "Oh man, I do NOT want to do this today!" I tried every which way to talk myself out of a work out - and I had some great reasons why NOT to work out - but I realized that I just needed to do it, but I would compromise and do only the upper body portion. Okay, I could handle that.
I did Chest, back, shoulders biceps and triceps. Then realized I probably COULD do legs. So I did legs, thinking I'd do abs later today in my step class. Then I thought, "Oh, what the heck, I'm already late for work, what's 10 more minutes?" And did abs.
I guess what I'm trying to say is that sometimes the hardest part of a work out is actually starting the darned thing.