1. I'm too out-of-shape.
If you can move, you aren't. Start slow - REALLY slow if you have to. Want to know what you are NOT too out-of-shape to do? Die. And die fat.
2. Running causes injuries.
Besides the fact that studies show how running builds UP your muscles and joints, you know what else caused injuries? Bathing. And walking to the store. And driving to the store. And breathing. Studies show that 99.9% of injuries happen while we are breathing. Should we stop that, too?
3. It'll ruin my knees (joints, body, etc.)
The knee is an unbelievable marvel. It can handle just about anything your reasonably do to it. And if it can't, it is not because running did it to it. I ran 52 Marathons in 358 days in 2006. My knees are just fine.
4. I don't have enough time.
No one does not have enough time for a little exercise. You MAKE time. Even 15 minutes a day is better than nothing.
5. I've never been good at running.
Are you ever good at something immediately? Rarely. If you are - kudos. God forbid you have to work at something. Running is like everything else; if you run and take it slow, eventually you'll get better at it.
6. The shoes cost too much.
Liposuction, angioplasty, doctor's visits and funerals are costly too.
7. I'm tired.
Exercise releases endorphins (making you feel happy) and it can help wake you up. I always feel more invigorated after a run. Want to know why it is harder to get out of bed after a LONG sleep? Because your body gets used to the rest. Run. Your body will get used to the exercise.
8. Running is hard work.
It can be. Suck it up. Life is hard. Get a helmet. But if you run then you can race and then you have something to talk about other than Glee.
9. It's too hot (or too cold.)
Then find the perfect air-conditioned temperature for yourself and run on a treadmill. Or wear more clothes outside. Or less clothes. Either way – go run!
10. It's boring.
No more than trying to explain how much exercise and running can save your life. And if being in the fresh air, enjoying nature while reaping extra benefits of both a pleasant mind and healthy body are boring then I am surprised you got to number 10 on this list.