Muscle contraction is the tightening, shortening, or lengthening of muscles when you do some activity. It can happen when you hold or pick up something, or when you stretch or exercise with weights.

The quest for bigger biceps is timeless. Ask anyone from a young child to an experienced athlete to show you their muscles, and they’ll almost always raise their arm and flex their biceps in response.

Building bigger biceps is one of the most common fitness goals we all share and for good reason. Strong arms don’t just look impressive; they help us lift groceries, carry kids, improve posture and ...