Try fartlek!
"Fartlek" is Swedish for "speed play" and consists of bursts of speed in the middle of a training run. After you warming-up, try running at an easy training pace, throwing in bursts of speed for various distances throughout the run. Vary the speed and times of the speed sections, from as short as 15 seconds to as long as 2-3 minutes. Between these bursts, allow yourself enough recovery time to match roughly 2/3 of the effort time.
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