Jeff Seidのインスタグラム(jeff_seid) - 6月30日 05時59分

Doing one of my favorite bicep exercises, concentration curls, for the long head of the bicep aka the PEAK (outer head).
You can either do it standing or seated like I am in the picture. Try switching up your next bicep workout by doing concentration curls as your first exercise and instead of going high reps, try doing 6-8 reps with weight you can use good form on.
@vqfit

[BIHAKUEN]UVシールド(UVShield)

>> 飲む日焼け止め！「UVシールド」を購入する