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		 Chinups are for fags,  do pullups. You won't be able to do 100 though. 
 
There's basically two ways to "tone up". One is to add lots of lean muscle mass without adding at fat. This will bring down your overall body fat percentage and the increased muscle mass will help you to look more toned over all. 
 
The second way is to lose fat.  This is accomplished with calorie deficit diets and lots of moderate cardio (1 hour a day is best). In this case,  situps, pushups, etc are going to be of little value.  Better to do core exercises, squats, deadlifts, bench press, leg press in high rep sets to increase metabolism a little. 
 
Usually some combination of gaining muscle and losing fat is employed.  Let's face it though, a month isn't very long 
		
	
		
		
		
		
			
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