is the ipod shuffle or nano good for exercise if you just use the clip on the unit, and connect to your shorts? if so, does it feel like it's too loose, might fall off?

I often use my shuffle while exercising, cleaning, and just generally going about my day. Never once has it come unclipped exept for when I got the earbud cord caught on something and got said earbuds yanked out of my ears. I have permanently solved that problem by simply running the cord under my shirt. Works like a charm! 😉 I can't answer you about the nano, though I'd say it has a higher likelihood of coming off as it is a bit heavier.