A Fartlek (swedish for “speed play”) workout involves sprinting and jogging off and on during a run. For example, a normal fartlek workout will be a 20-60 minute run. However, instead of keeping...
A Fartlek (swedish for “speed play”) workout involves sprinting and jogging off and on during a run. For example, a normal fartlek workout will be a 20-60 minute run. However, instead of keeping...