How Iridium Programs This

Iridium tracks trail running as direct volume for the quadriceps and calves rather than just generic cardio. It references your 7-day workout history to ensure these muscle groups are recovered enough for the terrain, and updates your fatigue scores to adjust the intensity of upcoming lower-body sessions.

Form Cues

Scan the trail 10-15 feet ahead to anticipate obstacles like roots or rocks
Shorten your stride and increase cadence to improve balance and reaction time
Keep arms slightly wider than usual to act as a counterbalance
Lean into uphills from the ankles while driving with your glutes
Land softly with a midfoot strike to absorb impact on descents

Don't

Don't look straight down at your feet, as you will miss upcoming hazards
Don't overstride on downhills, which increases braking forces on your joints
Don't run with rigid or tense shoulders
Don't lock your knees on impact

Common Mistakes

Overstriding on descents
Wearing shoes with insufficient traction
Looking only at the ground directly beneath you
Running too fast on technical sections
Neglecting hydration on remote routes

Muscles Worked

This exercise is a powerhouse for the lower body, primarily targeting the quadriceps and calves as they handle impact and propulsion on slopes. The uneven terrain also forces high engagement from secondary muscles like the glutes, hamstrings, and core stabilizers to maintain balance and prevent falls.