If you feel that building muscle and burning fat is important to your lifestyle, you've probably seen those guys in the muscle magazines hauling massive amount of iron and bulging out all over.
When you get to know more about their workout, you find out that most of them got big with free weights.
Free weights allow your muscles to work as a team to lift bigger, heavier weights.
They challenge your smaller muscles to balance and maintain stability during the flexing, contraction and pulling motion of your reps.
  You will see guys working the barbells for squats and dead lifts for creating massive muscles but did you know that dumbbells play a significant part as well?   You can see the power of using dumbbells in compound exercises.
  To build muscle fast increase endurance and lose the fat, you need to explore super-sets using dumbbells.
Here is a great four week routine to get your muscles up and pumping.
  Super-sets are two or more exercises done without stopping.
You complete the first   Pick a dumbbell for your routine and workout three times a week.
You'll rest on alternate days or do your cardio on that day off.
Increase the weight you use as your muscles become used to reps between 8 and 20 reps.
Start with weights that allow you to do 12 reps with perfect form and complete the super-set.
Decrease the number of reps each time you perform the exercise.
The standard is 12-10-8 for your 3 sets.
This will allow you to increase strength progressively.
  You'll switch between two routines; you'll start with Routine 1 the first week and switch to Routine 2 the second week.
On the third week, you go back to Routine 1.
What I do is complete all 3 sets of each super-set.
You'll want to increase the number of sets in weeks 3 and 4 to challenge your muscles.
You can also increase the weight used instead.
  Super-set Routine 1: Start with - Dumbbell floor press Dumbbell suitcase deep squats   Super-set - Dumbbell military press Dumbbell sumo deadlifts   Super-set- Dumbbell bent over rows Dumbbell crunch   Super-set Routine 2: Start with - Dumbbell one arm floor press Dumbbell split squat   Super-set- Dumbbell one arm military press Dumbbell deadlift   Super-set- Dumbbell one arm row Dumbbell good morning   Perform 3-5 sets and do the 12-10-8 reps.
  Rest for a full minute between super-sets.
Cool down with a 5 minute low impact cardio routine.
You'll want to go as heavy as you can during the last week to over-stimulate your growth hormones.
Go back to your regular routine for a few months and try it again.
You'll see measurable growth with a bulking diet.
Don't forget to give yourself plenty of time to rest and recover.