In the 1930s, Swedish Olympian Gösta Holmér introduced a training method called fartlek, which translates to "speed play." It's an effective workout style with a fun name to boot! This speed play is when we mix periods of faster movement with slower recovery intervals. Think: jog, then sprint, then jog again. But make it spontaneous. Less structure means more fun. We decide when to speed up, how long to hold it, and when to cruise. Although fartlek is rooted in running, the c
