Your joints are genetic and your biceps arent involved in thrusting punches forward anyway. The wrists probably wont get much bigger but if you want to strengthen them work on focus pads, makiwara (?), sandbag and heavy bag. Do that with total attention to form and body mechanics. You could also try things like wrist curls with weights or wrapping the rope round the bar exercise.
__________________ Sweat more now, bleed less later.
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