Too busy to exercise? It's easy to feel that way, particularly if you're trying to follow the exercise guidelines, which suggest an hour a day most days of the week. However, experts have found that short workouts, two or three 10 minute workouts a day, for example, can be just as effective as longer workouts.﻿﻿ The key is to focus on intensity and use your time wisely.

So how do you add intensity to your workouts? Try high-impact activities like jogging, jumping rope or plyometrics. If high-impact isn't your thing, you can absolutely get a great workout with low impact exercise.﻿﻿ The key is to try compound moves to work for more than one muscle group or if you're doing low impact cardio, speed, and range of motion will definitely get your heart rate up.

The sample workouts below offer a variety of cardio and strength ideas to get the most out of your exercise time. Remember, the number of calories you burn is based on a number of factors like your age, weight, body composition, intensity level and more, so it may not be exactly 100 calories for each person.

One other point: The warm-ups in these workouts are very short and you may need more time to get your body ready for exercise to avoid injury.﻿﻿ Feel free to add more warm-up time and don't forget to cool down and stretch after each workout.