for the last week, i've been doing 20 reps/day with a single 2.3kg / 5lb dumbell (appox + only one i have, dunno where the other is) on each arm. last night did 100+reps/each arm.
i useally do 20 going to the side from my body up, then 20 just going up/down. i've noticed muscle gain in both of my arms, but to the side of my arm. not/next to none going up.
the yellow part = gaining
red/purple part = not gaining as much
i want to improve the red/purple muscle more, can anybody gimme some tips on how to use my weight to do so?
thanks in advance.
+rep to everyone that helps.



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It's a shorter distance yes, but the shorter distance will work the muscle more since you're stopping the dumbell from relaxing down at your thigh's height, and the sudden stop and lift of the curl when it's at the height of your waist will make the bicep muscle work harder to lift the weight.

