I don't want to add fat and have found in the past if i try and bulk up i end up adding too much fat with the extra muscle.
The 80/20 Rule of Increasing Muscle Mass
For most individual the 80/20 Rule applies. When gaining muscle mass/body weight, some body fat is usually going to occur.
With a well written diet and exercise plan, most likely 80% of the weight gain will be muscle mass and around 20% will be body fat.
Obese individual tend to be the exception to the rule.
Caloric Intake
Research (Drs Layne Norton and John Ivy) shows that increasing your caloric intake approximately 20% above maintenance is most effective at increasing muscle mass while minimizing fat gain.
Calorie Rotation
Research essentially confirm the "Bulk and Cut Method" Bodybuilder have successfully used for decades, which is Calorie Rotation.
Research demonstrated the decreasing your caloric intake for two weeks and then going back to maintenance for two weeks, decreased body fat while preserving muscle mass.
Thus, you continuously rotating your caloric intake every two weeks.
Increasing Muscle Mass While Minimizing Body Fat Gain
The same strategy for losing weight (decreasing body fat and maintaining muscle mass) works for increasing muscle mass and minimizing fat gain.
Essentially you just turn it upside down.
1) Increase Caloric Intake approximately 20% above maintenance for two weeks.
2) Decrease Caloric back to maintenance for two weeks.
3) Repeat the above process.
Determining Caloric Maintenance
First you need to determine the number of calories you are consuming, while maintaining your body weight.
1) The Three Day Recall: Count your calories for three days.
2) Then divide your three day total by three to determine your daily average caloric intake. One of those three days needs to be a weekend, due to the fact that you eating habits change.
The General Adaptation Syndrome
The the foundation of Calorie Rotation has to due with The General Adaptation Syndrome. Periodization Training is based on this principle.
When stress is placed on the body, you either adapt or possibly die.
Once adaptation occurs you stop making progress. Your body has adapted to the Training Program or in this case your Caloric Intake.
When stop making progress, something need to change.
Kenny Croxdale