Final answer:
Putting the Sun at the athletes' backs is a communication strategy that can prevent the clear delivery of a message to athletes due to glare and visibility issues, whereas maintaining eye contact and clear body language are effective strategies that contribute to better communication.
Step-by-step explanation:
Within the various strategies to communicate effectively with athletes, one that could prevent you from delivering a clear message is d. putting the Sun at your athlete's backs. This is because the glare of the sun can be distracting or make it difficult for the athletes to see you, thereby hindering clear communication. On the other hand, maintaining eye contact, having athletes describe their vision of performing tasks, and discussing plans are all strategies that can enhance communication by ensuring engagement and clarity of the message.
It is crucial to maintain eye contact as it showcases that you are engaged and signifies that you are actively involved in the communication process. Furthermore, clear body language on camera indicates that you're poised and confident, which can positively influence your credibility as a coach or speaker.