I'd like to work until 70 (I'm 50 now). Mostly this is due to lack of imagination and/or discipline. I fear that if I stop working, I'll stop moving.

As it is, I'm lucky. I can cycle to work during the warmer months and I live next to a nice state park which allows me to hike for a nice half-hour every morning before heading off to work. If I can do this forever, I'd be happy.

Weekends remind me how undisciplined I can be. During the week, I'm up before dawn, take a shower and at the fisrt light of day, I have the dog on a leash and we're traipsing up and down hills in the woods. On weekends, I usually do not get out of bed until nine, and then spend about an hour or two on the computer before ever leaving the house. I fear that upon retirement, my weekend lifestyle will take over and I'll deteriorate rather quickly.