The impact of running is hard on the body, and is something that you need to work up to gradually. But 289 lbs will result in extra force and impact on the legs. And it sounds like right now you are feeling this.
My advice would be to let your legs recover for the time being, but keep working out to the extent you can (eg. strength training, low impact DVD's, etc). And then between now and the end of the year, walk as your workout. Walking is moderate in impact, and good in building up a solid base before running. And hopefully you will see some more weight loss along the way.
Sometime around New Year, you could then start transitioning to running through a Couch to 5K plan. www.sparkpeople.com/resource/fitness_artic
Rather than running continuously, these plans work through progressively increasing intervals of running and walking. Keep your running pace down (less speed = less impact), keep your running down to 3 times per week (to allow your muscles and bones to recover and get stronger), and don't be afraid to repeat a week of C25K if you feel you need to - it's not a sign of failure, its giving your body more time to adapt to the stresses and impact of running. Also, try to find a surface with more 'give' in it, whether it is a trail, running on grass in a park, or even a high school running track.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
| current weight: 178.0