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Workout Description

With a 60-minute time cap: For time: 2-mile run Then 9 rounds of: 20-calorie row 20 burpees Then 3 rounds for time of 30 push-ups 30 pull-ups 30 burpees ♀ Wear a 14-lb weight vest ♂ Wear a 20-lb weight vest

Why This Workout Is Extremely Hard

This workout combines extreme volume, a weighted vest, and brutal movement interference across three distinct phases. The 2-mile run with a vest destroys the legs before 9 rounds of 20-cal rows and 20 burpees (180 burpees total), then demands 90 push-ups, 90 pull-ups, and 90 more burpees. Cumulative fatigue is catastrophic — grip, lungs, shoulders, and legs are all simultaneously compromised. Most average athletes won't finish within 60 minutes.

Training Focus

This workout develops the following fitness attributes:

  • Endurance (10/10): A 2-mile run, 9 rounds of rowing and burpees, plus 270 reps of calisthenics under a 60-minute cap with a weight vest creates an extreme sustained cardiovascular demand throughout the entire workout.
  • Stamina (10/10): Massive volume across burpees, push-ups, pull-ups, and rowing — all under load — demands extraordinary muscular endurance. Upper body pushing and pulling muscles face hundreds of cumulative reps under fatigue.
  • Speed (5/10): A 60-minute time cap incentivizes efficient pacing and fast transitions, but the extreme volume and vest load require strategic steady-state effort rather than true sprint cycling.
  • Strength (2/10): The weight vest adds modest load, but all movements are bodyweight-based. No maximal force production is required; the stimulus is endurance-oriented rather than strength-focused.
  • Flexibility (2/10): Standard range of motion is needed for running, rowing, burpees, push-ups, and pull-ups. No extreme mobility demands are present, though hip flexor and thoracic mobility support performance.
  • Power (2/10): Burpees have a minor explosive component, but the sheer volume and fatigue accumulation shift the stimulus away from power expression toward grinding muscular endurance and pacing.

Movements

  • Push-Up
  • Burpee
  • Run
  • Row
  • Pull-Up

Scaling Options

Weight vest: Reduce to 10 lb (women) / 14 lb (men), or remove the vest entirely for newer athletes or those with shoulder/back limitations. Run: Reduce to 1.5 miles or substitute a 1,000-meter row or 3-mile bike. Row calories: Reduce to 12-15 calories per round. Burpees (Phase 2): Reduce to 15 per round. Phase 3 volume: Reduce to 2 rounds, or reduce reps to 20 push-ups / 20 pull-ups / 20 burpees per round. Pull-up substitutions: Banded pull-ups, ring rows, or jumping pull-ups with controlled descent. Push-up substitutions: Knee push-ups or elevated push-ups on a box. If the full workout is clearly going to exceed 60 minutes, prioritize completing Phase 1 and Phase 2 fully before attempting Phase 3, rather than cutting rounds mid-workout.

Scaling Explanation

Scale the vest if you cannot maintain a conversational pace on the run or if your burpee mechanics break down (collapsing chest, no hip extension at the top) within the first 3 rounds. Scale volume if you are newer to high-rep gymnastics or if your pull-ups are inconsistent — doing 90 pull-ups under fatigue with a vest is an injury risk for athletes without a solid base. The goal is to finish within the 60-minute cap while keeping movement quality intact, especially on pull-ups and push-ups where shoulder fatigue can lead to poor positioning. Prioritize intensity and consistent movement over Rx weight. An athlete finishing in 55 minutes without a vest is getting a better stimulus than one who DNFs at round 6 of Phase 2 with a vest. Mental toughness is the real Rx here — scale the load, not the effort.

Intended Stimulus

This is a long-duration, gut-check grind targeting the 45-75 minute time domain — a true test of aerobic capacity, mental fortitude, and muscular endurance under load. The weight vest transforms every movement into a strength-endurance challenge, demanding that your engine keeps running even as your body fatigues. The primary challenge is mental: three distinct phases with different movement patterns means you must reset your focus multiple times when you're already deep in the hurt. Expect your lungs, legs, shoulders, and grip to all be taxed simultaneously. This is a Hero-style stimulus — not about speed, but about refusing to stop.

Coach Insight

Treat this as three separate races, not one. Phase 1 (2-mile run): Start conservatively — this is a warm-up for everything that follows. A pace 30-45 seconds slower than your comfortable 2-mile pace is smart. The vest will make this harder than it looks. Phase 2 (9 rounds of row + burpees): This is the meat of the workout. Set a sustainable row pace — aim for consistent calories per minute rather than sprinting and dying. On burpees, find a rhythm you can hold for all 9 rounds. Do NOT go out hot on round 1. A steady 15-20 burpees per minute pace is more effective than surging and crashing. Break early and often — sets of 10 on burpees are fine. Phase 3 (3 rounds of push-ups, pull-ups, burpees): Your shoulders and chest will be smoked. Break push-ups immediately — sets of 5-10 are realistic. Pull-ups will be the limiting factor; use small sets with short rest (5s, 5s, 5s, etc.). Burpees here are pure grit — just keep moving. Common mistakes: going too fast on the run, sprinting the first 2-3 rounds of rowing, doing big unbroken sets early in Phase 3 and then grinding to a halt. Transitions between movements should be brisk but controlled.

Benchmark Notes

In a vest with a 60-minute cap: a 2-mile run, nine rounds of a 20-calorie row and 20 burpees, then three rounds of 30 push-ups, 30 pull-ups and 30 burpees, about 630 reps with calories. An average athlete runs into the cap during the last rounds, so finishing at all is L6; capped athletes are graded by reps. L10 (under 40 min) runs the vested miles near 6:15 and holds about 1:50 per row-and-burpee round.

Modality Profile

5 movements total: Gymnastics = Burpee, Push-Up, Pull-Up (3 movements = 60%); Monostructural = Run, Row (2 movements = 40%); Weightlifting = none (0%). Rounded to nearest 10%.

Similar Workouts to FERN

If you enjoy FERN, you might also like these similar CrossFit WODs:

  • Murph (92% similar) - 1 mile Run 100 Pull-Ups 200 Push-Ups 300 Air Squats 1 mile Run...
  • Killer Elite (91% similar) - For time: 7 rounds of: 400 meter Run 24 Pull-Ups 24 Dips 34 Crunches 9 Burpees...
  • Grant (90% similar) - For Time 100 Burpees 1 mile Run 100 Pull-Ups 1 mile Run 100 Push-Ups Wear a Weight Vest (20/14 lb)...
  • Luce (90% similar) - For time, 3 rounds: 1,000 meter Run 10 Muscle-Ups 100 Air Squats Wear a weight vest (20/14 lb)....
  • Jared (90% similar) - For time: 4 rounds of: 800 meter Run 40 Pull-Ups 70 Push-Ups...
  • Shawn (90% similar) - For Time 5 mile Run After each 5 minute run interval: 50 Air Squats 50 Push-Ups...
  • Manuel (90% similar) - 5 Rounds for Reps in 50 minutes 3 minutes of Max Rope Climbs 2 minutes of Max Air Squats 2 minutes o...
  • Small (90% similar) - 3 Rounds For Time 1,000 meter Row 50 Burpees 50 Box Jumps (24/20 in) 800 meter Run ...

These WODs similar to FERN share comparable training demands, time domains, and movement patterns.

With a 60-minute time cap: For time: 2-mile run Then 9 rounds of: 20-calorie row 20 burpees Then 3 rounds for time of 30 push-ups 30 pull-ups 30 burpees ♀ Wear a 14-lb weight vest ♂ Wear a 20-lb weight vest

Difficulty:
Extremely Hard
Modality:
G
M
Stimulus:

This is a long-duration, gut-check grind targeting the 45-75 minute time domain — a true test of aerobic capacity, mental fortitude, and muscular endurance under load. The weight vest transforms every movement into a strength-endurance challenge, demanding that your engine keeps running even as your body fatigues. The primary challenge is mental: three distinct phases with different movement patterns means you must reset your focus multiple times when you're already deep in the hurt. Expect your lungs, legs, shoulders, and grip to all be taxed simultaneously. This is a Hero-style stimulus — not about speed, but about refusing to stop.

Insight:

Treat this as three separate races, not one. Phase 1 (2-mile run): Start conservatively — this is a warm-up for everything that follows. A pace 30-45 seconds slower than your comfortable 2-mile pace is smart. The vest will make this harder than it looks. Phase 2 (9 rounds of row + burpees): This is the meat of the workout. Set a sustainable row pace — aim for consistent calories per minute rather than sprinting and dying. On burpees, find a rhythm you can hold for all 9 rounds. Do NOT go out hot on round 1. A steady 15-20 burpees per minute pace is more effective than surging and crashing. Break early and often — sets of 10 on burpees are fine. Phase 3 (3 rounds of push-ups, pull-ups, burpees): Your shoulders and chest will be smoked. Break push-ups immediately — sets of 5-10 are realistic. Pull-ups will be the limiting factor; use small sets with short rest (5s, 5s, 5s, etc.). Burpees here are pure grit — just keep moving. Common mistakes: going too fast on the run, sprinting the first 2-3 rounds of rowing, doing big unbroken sets early in Phase 3 and then grinding to a halt. Transitions between movements should be brisk but controlled.

Scaling:

Weight vest: Reduce to 10 lb (women) / 14 lb (men), or remove the vest entirely for newer athletes or those with shoulder/back limitations. Run: Reduce to 1.5 miles or substitute a 1,000-meter row or 3-mile bike. Row calories: Reduce to 12-15 calories per round. Burpees (Phase 2): Reduce to 15 per round. Phase 3 volume: Reduce to 2 rounds, or reduce reps to 20 push-ups / 20 pull-ups / 20 burpees per round. Pull-up substitutions: Banded pull-ups, ring rows, or jumping pull-ups with controlled descent. Push-up substitutions: Knee push-ups or elevated push-ups on a box. If the full workout is clearly going to exceed 60 minutes, prioritize completing Phase 1 and Phase 2 fully before attempting Phase 3, rather than cutting rounds mid-workout.

Time Distribution:
47:30Elite
1:00:00Target
1:00:00Time Cap
Your Scores:
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Training Profile

Performance Levels
L1
L2
L3
L4
L5
L6
L7
L8
L9
L10
RookieNoviceIntermediateAdvancedPro/Elite