I tried sprinting for a month and it didn't budge. Now I'm doing long-distance running, but I absolutely hate it. I just want to get my heart rate down to an athletic level as quickly as possible so I can focus on other, funner things/maintain it with other, funner things (like getting muscular, strong, and powerful).
How do I get it down to below 40? How fast does it take to get your heart rate down at all? Also, is a high resting heart rate part of the reason why you get tired quickly?