If you're doing any type of cardio, whether it be jogging outside or on a treadmill, on an elliptical, or biking/spinning, try interval training. If you want to take a jog, try jogging, then speed walking, then sprinting for a short amount of time, then running, and repeating the pattern. You should have a goal for what you want your heart rate to get up to. If on a treadmill, raise and lower the incline while jogging, walking, and running. If on an elliptical, do the same thing with the incline and go at a faster pace and slower pace at times, and same goes for the bike, you get what I'm saying.
Interval training is important because it gets your heart rate going, which means you are getting a better workout and burning more fat and calories.
Another thing to be said: Invest in a heart rate monitor! These things are critical and effective because without them, who knows what your heart rate is at?! Not only does it tell you your heart rate (BPM) and include an analog heart rate sensor/personal heart rate sensor, but it tells you the calories you have burned, a workout review, INDIGLO Night-Light, 24 hour time, month and date, and sometimes more.
Popular brands are Polar and Timex. Polar even offers a bluetooth heart rate monitor sensor for your smartphone. I bought a Timex at Target (also sold at Walmart, other retail stores, and online), and a Polar at TJ Maxx because I couldn't resist the sale price. They're both really great. Some are more pricy than others, but they all have the basic functions. I found a Timex for as cheap as $35 online, which is a HUGE steal considering how pricy they can get. It is best to get one with a chest strap for complete accuracy.
