True or False: A tennis serve and a swimming start are considered closed sport skills.

The assertion that a tennis serve and a swimming start are considered closed sport skills is indeed accurate. Closed skills are characterized by being performed in a stable and predictable environment where the performer can plan the movement in advance and timing is not influenced by external factors.

In the case of a tennis serve, the player initiates the action in a controlled situation, typically with a stationary ball and a predictable court layout. The serve can be rehearsed repeatedly, allowing the player to develop a consistent technique without unexpected interruptions. Similarly, in swimming, a start is often executed from a position where the athlete is not subject to unanticipated changes in their environment, such as wind or opponents. The swimmer has control over the start and can focus on their technique without external distractions.

Thus, identifying both the tennis serve and the swimming start as closed sports skills aligns with the definition, affirming the statement as true.