I am worried about running outside due to the hot weather we have been having.
Up to 30 degrees you'll be fine provided you knock back a pint of water ten minutes before you go. Obviously you don't run on a 43C day like today.
Someone said to put the incline of the treadmill to 1 degree to simulate running outside? What are your thoughts on this?
They're different either way.
When running, your supporting foot pushes on the ground to propel you forward. On a treadmill, you pick up your foot and put it down as the band runs under you.
On those evolution running vids, notice they talk about how some of your energy goes to propelling you forwards, and some to picking your feet up and down, and how you should minimise the latter. Well, on a treadmill the latter is
all you do.
A treadmill is basically like skipping. That's fine for just burning calories and improving fitness, it's bad for improving your actual run technique and times.
If improving fitness is all you want, fine. If you're still wanting to join the forces - well, they're not going to test you on a treadmill, are they. Something you'll hear often while in uniform is "train they way you fight." Likewise, train the way you'll be tested.
You just have to get out there and pound the pavement. Or preferably the local oval, not so rough on your joints.