1. Do they pump up when you train them? Often weak body parts don’t pump up as we lack the neurological connection to them, and this can be fixed by tweaking form and exercise selection.
  2. Think around the issue. You may have poor biceps genetics, but what about focusing on developing your brachioradialis by prioritizing reverse curl variations for a while? This is an impressive smaller muscle that a bit of love and attention can go a long way to develop and improve the overall look of the arms.