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Hi I'm training to be able to do trail and fell runs, not planning on entering any race just yet, I'm just doing it for the enjoyment of being in the outdoors and the feeling of personal achievement.
Anyway, I'm doing interval training on treadmill, I do 2 mins walking at 4mph, 2 mins jog at 6mph and then 2 mins at 7.5mph, all on an incline of 2.0. Today I reached my target of 5 intervals so I upped the speed in the last minute to 8mph and did an extra 30 secs too. Is this a good way to do interval training and now that I have hit my target should I up the speed next time or up the incline?