Walking...

That sounds simple enought, right? Well it is, but there are ways you can walk that makes exercising more effective and efficient. You can't walk with the intentions of toning and losing weight the same way you casually walk around the house or the office. I've put together a list of techniques that you can do to help when you're walking for exercise. You may think these are crazy, but here they are.
-Bend your elbows. This will cause your arms to swing faster which in return will help your legs to move faster.
-Keep your stride short. Don't take long strides that feel awkward.
-Think heal-to-toe. Push-off with your heal. Toes should leave the ground last.
-Keep your abs pulled in and tight.
-Include interval training walks that include periods of very brisk walking followed by slower, recovery times.
-Remember to always stretch and warm-up.

Start Jogging

I can't remember when I first started running/jogging. I just always remember doing it, but a friend of mine ask me to help him get started. I tried to think how I could help him, but it made me realize that jogging is not something someone can just one day start doing.
The best way to start jogging is to gradually build up your fitness over time through power walking. Once you feel your fitness has improved you can then start to introduce short sections of jogging. Make sure you always adequately warm up, before you start to jog, and a cool down during your last 10-15 mins of exercise.
Most importantly listen to your body - if you do not feel like exercising because you are very tired, DON'T. The next time you go out, don't try to make up for your missed session by doing an extra long or fast session, take your time and gradually build up your sessions, improvement will come with the enjoyment!

Flexibility

Being a sports fan, I've noticed how many more professional athletes--specifically baseball players--seem to get hurt easier than they use to. The majority of them, however, are so much bigger than they use to be. Listening to one of my favorite pitchers of all time, Greg Maddux, I now completely understand why. It's not rocket science.

The answer he gave is true for everybody who exercises. Maddux explained that, whenever he was coming up as a baseball player, flexibility was a big thing. Today, during the home run era, strenght is the big thing. Players are strong, but less flexible; this is a big reason for more strained muscles and such.

Remember when you're exercising, always do a quick warm-up and stretch. While being strong and cut is cool, if you're constantly hurting it doesn't mean much. Just exercise smart.