Last week we did a 4-3-2-1 fartlek; this week it’s 5-4-3-2-1 twice over. So a little more endurance and, with it, a little more fun to bring in the festive season! WHAT? Fartlek Countdown to Christmas Pt.2 2 sets of: 5-4-3-2-1 minutes @ speeds of your choosing 1 minute jog recoveries Terrain: Undulating trails or[…]