You can hold yourself back for the first half of the run, or even two thirds and then speed up for the final bit. If you're not training for anything specifically I'd hold back on the hard running completely. All that foot slamming is bad for the legs, as I've found out to my detriment
You could load up some slower running tunes on your phone or whatever. You can buy music to match pace from Audiofuel (of C25k fame) or there are websites where music is grouped by bpm, 180 being fast, so go for tunes less than that, to keep you running more slowly
You can set your garmin etc for a slower pace before you set off, so it will beep and tell you if you're getting ahead of yourself
It's usually enough to tell yourself that you are going out for a slow jog. Pick a particularly scenic route and go and admire it at your leisure.
For the C25K programme the key is to keep your pace comfortable and breathing under control. A pace at which you could hold a conversation would be ideal but your actual speed is irrelevant. If you've got anything left in the tank towards the end then perhaps try a sprint finish in the last 30 seconds or so. Anyway, you'll find over time that you become aware of how different pacings feel. For a more accurate measure, a GPS running watch or running app on a smartphone will display live/average pacing stats and other goodies but during the course itself just take it easy and don't get hung up on the numbers. There will be plenty of time after you graduate for speed and racing if that's your thing. Good luck!
I have had the luxury of a Garmin from early on so I was able to watch my pace from the start. Even now, however, I use it more to hold my pace back rather than to keep me up to speed!
The best way to control your pace without one is probably by breathing effort: You should be able to comfortably complete a sentence without gasping or you are going too fast. Similarly, if you could comfortably sing then you could be going a little faster!
Keep it up - outdoor running is so much more fun that the treadmill!
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