What minimum elements must be included in an acro series according to beam SR 1?

In order to fulfill the requirements of an acro series on the balance beam, the gymnast must include at least two flight elements. This is a crucial component of the scoring criteria as it demonstrates the gymnast's ability to perform tasks that require both dynamics and a higher level of difficulty. Incorporating two flight elements showcases not only skill but also the ability to maintain balance and control while executing these elements.

This emphasis on flight elements is significant because they are essential in both demonstrating mastery of the apparatus and enhancing overall aesthetic performance. The requirement to include two flight elements distinguishes a more advanced routine, ensuring that the gymnast meets the challenge presented by the balance beam.

The other options might highlight other elements necessary on beam routines, but they do not satisfy the specific requirement of including two flight elements within the acro series, which is why the correct response aligns with this understanding.