What are the most effective strategies for balancing electrolyte and water intake during long, intense rides in extreme heat, and how can riders determine their individual hydration needs to avoid both dehydration and hyponatremia? Are there specific types of electrolyte-rich foods or supplements that are particularly well-suited for hot weather rides, and how can riders incorporate these into their fueling plans? Additionally, what are some proven techniques for monitoring body temperature and recognizing the early warning signs of heat exhaustion, and how can riders adjust their pace and behavior to stay safe in extreme heat? Are there any new technologies or products that have been shown to be particularly effective in helping riders stay cool and hydrated, such as advanced cooling vests or hydration packs? How can riders balance the need to stay cool and hydrated with the need to maintain a competitive pace or complete a challenging ride, and what are some strategies for managing the mental and physical challenges of riding in extreme heat?