RB100 Fitness

The series

Challenges

100 reps. A new habit. A reason to show up.

The RB100 challenges bring Relentless Bravery into your training: bodyweight tests, conditioning goals and everyday habits that give your effort a clear focus.

Choose a challenge that suits your starting point. Read its rules, scale the movement where needed, and favour controlled technique over chasing a number.

Latest challenge · 2026-01-22

Athlete performing strict ring rows with controlled tempo, neutral spine, and focused expression. Warm directional lighting, cinematic shadows, visible upper-back engagement

Challenge · 22 Jan 2026

100 Pull Rep Workout: Restore Balance and Build Resilient Strength

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Athlete mid-interval during a high-effort movement, visible strain but controlled posture

Challenge · 19 Jan 2026

100 Second Interval Workout: Build Conditioning Without Burnout

Athlete full flow on SkiErg, light sweat, focused expression

Challenge · 15 Jan 2026

100 Calorie Hybrid Workout: Learn to Pace Under Fatigue

Athlete performing a strict push-up with perfect body alignment

Challenge · 12 Jan 2026

100 Push-Up Progression Challenge: Build Upper-Body Control

Athlete performing a heavy farmer carry, mid-stride, upright posture

Challenge · 8 Jan 2026

100 Metre Carry Challenge: Build Real-World Strength and Capacity

Athlete performing a deep controlled squat with upright torso and calm focus. Warm directional lighting, dramatic but clean shadows, visible muscle tension without strain

Challenge · 5 Jan 2026

100 Squat Fitness Challenge: Build Strength Through Quality

Dark industrial gym environment at early morning light. Athlete moving steadily on a treadmill while another rows in the background

Challenge · 1 Jan 2026

100 Minute Aerobic Training Challenge: Build Your Hybrid Engine

Side view of athlete mid-SkiErg sprint, explosive effort, gym lighting with shadows

Challenge · 31 Oct 2025

Join the 2025 SkiErg World Sprints (1000m Challenge)

Collage of athletes performing diverse RB100 challenges

Challenge · 11 Apr 2025

#100: Your Ultimate Fitness Benchmark - Combine 10 RB100 Challenges Into 1 Relentless Test

Athlete mid-rep hoisting a heavy sandbag onto their shoulder, hips extended, bag cradled tight

Challenge · 10 Apr 2025

#99: 100 Sandbag Shouldering Reps (For Real-World Strength)

Athlete performing a controlled step-back lunge holding dumbbells

Challenge · 8 Apr 2025

#98: 100 Weighted Step-Back Lunges (Dumbbells, Barbell or Sandbag)

Athlete explosively launching a wall ball overhead toward a height marker on a brick wall, legs extended, arms fully vertical

Challenge · 7 Apr 2025

#97: 100 Overhead Wall Ball Throws (Target for Height or Distance)

Athlete performing a side plank rotation, upper arm reaching under the torso

Challenge · 6 Apr 2025

#96: 100 Side Plank Rotations (For Oblique Strength & Shoulder Stability)