Yesterday, Mark Zuckerberg launched Threads, and while the new social media app is being described as a potential "Twitter killer," it's currently missing one major feature. And if you can't bring yourself to ditch Twitter just yet, that's fine, too; after all, Aaron Rodgers still can't even bring himself to quit the Packers. But if you're trying to get in NFL shape — or any kind of shape, for that matter — can running in the heat actually make you faster? We've got the answer here.