Definitely do some of each during your workout. That's called high impact interval training (Google HIIT), and it super revs your metabolism and increases fat burning. Plus it's highly efficient, only needing 20-30 minutes total time. It's something you can do everyday.
You can do your workout something like this:
5 minute warm-up
Walk/run hard as you can for 1 minute
Walk at half the speed for 3 minutes
Then repeat the interval for about 3 to 4 sets
And finally, 5 - 10 minute cool-down
When you find that the higher speed interval isn't challenging enough, but you don't want to increase the speed, then increase the incline.
Georgia
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