The involvement of other muscles avoid the heavy cheap type movements you find that some exercises are tougher than others to isolate the biceps standing barbell curls for instance must involve front dolts traps and lower back just keep   Lifeforce T-Boost concentrating on your biceps isolation as much as you can it's easier with such exercises as the preacher curl it's ideal for biceps isolation as are many kinds of cable and machine curls bodybuilders tend to drastically over train their of both biceps and triceps are such small muscles hand has said they are subject to a lot of stress you train your back chest your shoulders so you don't need to do in will sets and reps during your arm workouts mean 12 cents each for biceps and triceps funny I know water bottles Purdue us ./

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