Most budget treadmills (sub $1,000 price) are not equipped to handle the rigors of running or jogging.   Both activities are abusive to treadmills.  When you run, the impact is equivalent to approximately 2.5x your body weight.  Consider the constant pounding that a treadmill must absorb? 

In addition, the treadmill is running at a considerable faster speed in comparison to walking.   These are considerations when buying a treadmill for running or jogging.

• The motor – I would recommend you get a model with at least 2.5 continuous duty horsepower.  That is the HP where the treadmill runs comfortably, not the peak HP.  For runners, you are better off with a 3.0 HP motor.  The goal is to have a motor that does not strain when running at higher speeds.
• The deck – Get a treadmill with a 1″ deck, especially if you are a bit over weight.  You want a deck that can handle the constant impact. 
• The treadbelt- You want a machine with a quality treadbelt that will not stretch excessively from high speeds.
• Deck length – When you run or jog you need a longer deck.  For people of average height a 54″ or 55″ deck is adequate.  If you are tall, and/or a sprinter consider a 60″ deck. 
• Large rollers – A model with 2.5″ or larger rollers is suggested.  Larger rollers are better for extending the life of many of the components. 

I would recommend you spend a minimum of $1,000 if you plan on moderate jogging.  If you are a runner you want to price models in the $1,500 – $2,000 price range.  It is better to get a treadmill specifically designed for jogging or running. You less likely to “run” down your treadmill.   

Recommended treadmills for jogging – Sole F80, Smooth 6.25, New Balance 1400

Recommended treadmills for running – Sole F85, Smooth 9.25HR, PaceMaster Silver