Muscles can only contract and relax, so they always work in pairs called antagonistic muscles. Skeletal muscle is joined to bones. Its cells contract to make bones move and joints bend.

Keep your elbows close to your body to focus the effort on the biceps. Contraction: At the top of the movement, contract your ...

Getting well-defined biceps isn't a walk in the park, but with the right routine and consistency, you can hit that goal. The secret? Combining effective exercises that target all the arm muscles ...