What would happen if the biceps were attached to the top and bottom of your humerus instead?

If the biceps were attached to the top and bottom of the humerus, it would severely limit the muscle's ability to function effectively in flexing the elbow and rotating the forearm. Instead of facilitating movement, such an arrangement would likely result in restricted motion and reduced strength, making basic tasks like lifting or pulling more difficult. The arm's biomechanics would be fundamentally altered, likely leading to inefficient and awkward movements.