Your bike sprint workouts sound similar to Tabata cycling intervals: <a href="http:&#x2F;&#x2F;britishcyclesport.com&#x2F;2013&#x2F;training&#x2F;tabata-intervals&#x2F;" rel="nofollow">http:&#x2F;&#x2F;britishcyclesport.com&#x2F;2013&#x2F;training&#x2F;tabata-intervals&#x2F;</a><p>Got to agree workouts like that are <i>really</i> hard!