Do intervals or sprint repeats. Tabata intervals are wonderfull, do them with: running, bodyweight squats, dumbell swings, cone hops. Tabata intervals are 20 seconds of all out effort followed by 10 seconds of rest, repeated 6 to 8 times. Do Tabata intervals a few times a week, ad more traditional sprint intervals once a week. You will have to push through it in your training, but your lactic threshold will improve.
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Low expectations yield insignificant results
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