I'm happy about the third one since I'm always lazy about stretching. :D
It's fucking hard to start again after stopping, since you need to start with weights that used be your warm up weights and it just brings your morale down, I know.
But if you've worked out in the past, your body quickly remembers and adapts accordingly, and you're back on the bike in no time.
I used to be lazy about stretching too... :P till I forced myself to complete a yoga session that I hated doing... but I felt so amazing at the end of it that I got hooked on to it... kundalini yoga by Ana Brett... so much so that I prefer doing that now to going to the gym.
Never done it, but I've heard a lot of great things about yoga, so I can believe that.
Oh, do check it out! Atleast once. But, you may need to ensure you don't have an audience first. :)