Shellback Racing

Welcome To MAYHEM San Jose!

MAYHEM Fitness Race is an outdoor functional fitness challenge built for athletes who want more than a typical race. This high-intensity event fuses functional strength, endurance, and tactical, military-inspired movements into a true test of grit and resilience. Competitors will take on 10 demanding workout stations, each separated by a half-mile run up Montgomery Hill and back, pushing both physical and mental limits from start to finish. Athletes can choose to race in Open or Pro division, compete solo, with a partner, or as part of a team. Special awards will be given to placement winners in their respective categories. Whether you’re chasing the podium or simply proving something to yourself, MAYHEM is where fitness meets controlled chaos.

Note: In addition to our MAYHEM Fitness Race we are offering runners a 5k trail running race. Walkers are welcomed. 

The Deets…

When: Saturday, May 2, 2026 (start times will be provided two weeks before race day) 5K Trail Race will start at 8am.

Where: Montgomery Hill Park

Bib pick-up: TBA

Race Day Bib pick-up will be available.

Spectators are welcome! Bring your friends and family. This is a dog-friendly park. Bring your doggies!

We are always looking for volunteers to help with our event. All volunteers will receive a FREE race entry. Fill out the volunteer form below if you are interested in helping us with this event. 🙂

Volunteer Sign-Up. Click Here

Race Format

Rogue Echo Bike: 25/30/35 Calories

Zone #1. Athletes will begin seated on the Echo Bike with both feet on the pedals and hands on the handles. Athletes must pedal and drive the arms simultaneously until the monitor reaches their respective target calorie. Athletes must remain seated unless otherwise directed by a race official, and only forward pedaling is permitted. The station is complete once the display shows the correct calories, at which point the athlete may safely dismount and proceed forward with the race.

Women’s Open: 25 calories

Women’s Pro: 30 calories

Men’s Open: 30 calories

Men’s Pro: 35 calories

This movement targets the quadriceps, glutes, and hamstrings as the primary drivers, while the shoulders, chest, back, arms, and core work together to generate power, maintain stability, and sustain effort throughout the station.

30 Dumbbell Thrusters

At Zone #2, athletes will complete 30 dumbbell thrusters. Each repetition begins with the dumbbells at the shoulders. Athletes must descend into a squat breaking 90 degrees at the hips, then drive upward in one fluid motion, finishing with the dumbbells locked out overhead. Repetitions count only when full depth is achieved and the athlete reaches full hip, knee, and arm extension at the top.

Women’s Open: 40 lbs total

Women’s Pro: 50 lbs total

Men’s Open: 50 lbs total

Men’s Pro: 60 lbs total

This movement primarily targets the quadriceps, glutes, and hamstrings, while the shoulders and triceps drive the overhead press. The core and lower back are heavily engaged to stabilize the torso and transfer power throughout the movement.

1000 M Ski-Erg

At Zone #3, athletes will complete 1,000 meters on the SkiErg. Begin standing tall with both hands on the handles. Using a powerful downward pull, drive the handles past the hips while hinging slightly at the hips and maintaining control through the core. The repetition is complete as meters accumulate on the monitor, and the station is finished once the display reaches 1,000 meters.

This movement primarily targets the latissimus dorsi, shoulders, and triceps, while the core, glutes, and hamstrings assist with force generation and stability, and the cardiovascular system is heavily challenged throughout the effort.

50 Med Ball Sit-Ups

 

At Zone #4, athletes will complete 50 medicine ball sit-ups. Each repetition begins with the athlete seated on the ground holding the medicine ball over the head. From a fully lowered position with the shoulders touching the ground, the athlete will sit up until the torso is upright and the medicine ball is brought over the knees. Repetitions count only when full range of motion is achieved.

Women’s Open/Pro: 14 lbs

Men’s Open/Pro: 20 lbs

This movement primarily targets the abdominals and hip flexors, while the obliques and lower back assist with trunk control and stability throughout the set.

1000 M Row

 

At Zone #5, athletes will complete 1,000 meters on the RowErg. Begin seated with feet secured in the foot straps and hands on the handle. Each stroke starts with a powerful leg drive, followed by a controlled pull of the handle to the chest, then a smooth return to the starting position. Meters accumulate on the monitor, and the station is complete once 1,000 meters is reached. Once complete, athletes must raised their hand to signal the official for verification before moving on with the race.

This movement primarily targets the quadriceps, glutes, and hamstrings, with the back, shoulders, and arms contributing to the pull, while the core remains engaged to maintain posture and transfer power throughout the effort.

50 M Dumbbell Bear Crawl

 

At Zone #6, athletes will complete a 50-meter dumbbell bear crawl. Begin in a bear crawl position with a dumbbell held in each hand, knees hovering off the ground. Move forward by alternating hand and foot placements while maintaining control of the dumbbells and keeping the hips low and core engaged. Athletes must remain in the bear crawl position for the entire distance, and the station is complete once the full 50 meters are covered. 

Women’s Open: 60 lbs

Women’s Pro: 80 lbs

Men’s Open: 80 lbs

Men’s Pro: 100 lbs

This movement primarily targets the shoulders, chest, and triceps, while heavily engaging the core, quadriceps, and glutes for stability, with additional demand placed on the forearms and grip strength throughout the crawl.

50 M Tire Drag

At Zone #7, athletes will complete a 50-meter tire drag. Athletes may choose to move forward or backward while pulling the tire using the provided rope. The tire must remain in continuous motion, and athletes may not lift or carry it. The station is complete once the tire has been dragged the full 50 meters.

Tire Weight: 100 lbs

This movement primarily targets the glutes, quadriceps, and hamstrings, with heavy engagement of the calves and core for propulsion and stability. The upper back, shoulders, and arms assist with pulling and control, especially when moving backward.

Ball Over Yoke: 50 Reps

At Zone #9, athletes will complete 50 ball over yoke repetitions using a weighted medicine ball. Each repetition begins with the ball on the ground. Athletes will lift the ball, extend through the hips, and toss the ball over the 7-foot bar to the opposite side. The ball must clearly pass over the bar for the repetition to count, and athletes may retrieve the ball and continue until all required repetitions are completed.

Note: For Doubles, athletes cannot catch the ball. The ball must land on the ground before picking back up.

Women’s Open: 20 lbs

Women’s Pro: 30 lbs

Men’s Open: 30 lbs

Men’s Pro: 40 lbs

This movement primarily targets the glutes, hamstrings, and quadriceps through explosive hip extension, while the shoulders, chest, and triceps assist with the throw. The core and lower back are heavily engaged to stabilize the body and transfer power during the lift and toss.

50 M Sandbag Burden Carry Uphill

At Zone #9, athletes will complete a 50-meter burden carry with a sandbag. Athletes will lift the sandbag and carry it uphill to a designated marker, then return back downhill to the start for a total distance of 50 meters. The sandbag must be carried in a front-load position, and it must not be dropped outside the designated carry zone. The station is complete once the full distance is covered.

Women’s Open: 50 lbs

Women’s Pro: 70 lbs

Men’s Open: 70 lbs

Men’s Pro: 100 lbs

This movement primarily targets the glutes, quadriceps, and hamstrings, while the core and lower back work to stabilize the load. The upper back, shoulders, arms, and grip are heavily engaged to control and maintain the sandbag throughout the carry, with additional demand placed on the calves during the uphill portion.

Burpee Box Jumps: 25

At Zone #10, athletes will complete 25 burpee box jumps. Each repetition begins with the athlete performing a burpee, chest and thighs touching the ground at the bottom. From the burpee, the athlete will jump onto the box with both feet, standing fully upright at the top to complete the rep. Athletes may step or jump down from the box before beginning the next repetition. Repetitions count only when full extension is achieved on top of the box.

Note: For the Open Format, athletes may step up on the box.

Women’s: 20″ Box

Men’s: 24″ Box

This movement targets the quadriceps, glutes, and hamstrings for jumping power, while the chest, shoulders, and triceps are engaged during the burpee. The core is heavily involved for stability and control, and the cardiovascular system is highly challenged due to the explosive, full-body nature of the movement.

Mayhem Divisions

Open – The standard MAYHEM challenge, built to push you while keeping the race attainable.

Pro – Built for seasoned athletes, with higher volume and intensity to elevate the challenge.

 

Doubles – Grab a partner and take on HYROX as a team. Run together, and divide the workout stations however it works best for you. Mixed Doubles will use men’s weights and reps.

Relay Teams – Grab your crew and tackle MAYHEM together! In this division, five teammates split the course, with each athlete running two half-mile sprints and crushing two workout stations before tagging the next teammate. Fast, fierce, and full of teamwork—this is MAYHEM at its most explosive.

MAYHEM Fitness Running Route

5K Course Map (run only)