Do light weights with high reps tone your arms?

On Ep. 388, Nikkiey is blunt: you can't tone a muscle that isn't there. Muscles grow or shrink, and body fat goes up or down. The look women call toned is the mix of how much muscle you have and how much fat sits over it. She adds that you can build muscle across a range of reps, so high reps alone aren't the issue. The issue is effort. If you're doing 20 reps with a weight you could have lifted 45 times, you're going through the motions, and your muscles need a reason to adapt.

In her videos, she shares her own story: she did arm circles with light weights for months and the backs of her arms never changed. They only started changing when she picked up a real dumbbell and pressed it overhead. The tricep line is worked by pressing movements that use your chest, shoulders and triceps together, and she says two-pound arm circles don't create enough tension to trigger anything. She also notes the upper body is where a small amount of new muscle tends to show up fastest.

And if fear of bulking keeps you light, Nikkiey says women don't get bulky by accident from picking up a 20-pound dumbbell. Real load plus managing your nutrition is what creates the look you're after. It was never your effort; it was the plan.