Struggling through the heat

For the past few weeks I have been struggling with the heat and humidity. I run very early (4 am) so I usually get the best weather of the day. After my first two miles of any run my legs felt like I had just ran 10 miles. I looked all over the internet about dehydration and it seemed to be common for runners to feel this way in the heat and humidity. I found a product called Endurolytes and they are working for me so far. My legs feel so much better and my recovery feels so much better. I have brought them with me on my long runs the last two weeks and they are really helping me.