HomeCaliforniaFortuna › JSK 5.0 Humboldt Martial Arts and Fitness

JSK 5.0 Humboldt Martial Arts and Fitness

4.6 ★★★★★ 19 Google reviews · Kickboxing gym in Fortuna, California

Kickboxing gym Kids & teens Cardio kickboxing

Plan your first class

  • Cardio kickboxing classes high-energy cardio kickboxing on the bags and pads — a fun, sweaty workout built for fitness and weight loss, at your own pace
  • Kids & teen classes kids and teen kickboxing classes (ages 4–16) — built around confidence, focus, and fun
  • Sparring sparring and partner work for members who want it — always optional, eased in gradually, with the coach controlling the contact
  • Today see hours ·
  • Website & schedule fortunamartialarts.com — book classes and see the live schedule
  • Phone +1 707-499-4871

Hours

Monday 3–8 pm
Tuesday 3:30–8 pm
Wednesday 3–8 pm
Thursday 3:30–8 pm
Friday 4–6:30 pm
Saturday 9 am–12:30 pm
Sunday Closed

Hours shift for holidays and class-schedule changes — worth a quick check before a special trip.

The classes they run

Kickboxing classes on the schedule at JSK 5.0 Humboldt Martial Arts and Fitness, confirmed in members' own reviews and the gym's own info — not guessed from the sign out front.

🧒 Kids Kickboxing 11 mentions

“My son started with him last summer and we enjoyed the program so much that my daughter and I joined, as well.”

All gyms that run kids kickboxing →

🤜 Sparring

“They also have kick boxing and sparring classes too.”

All gyms that run sparring →

🥊 Boxing

“They also have kick boxing and sparring classes too.”

All gyms that run boxing →

Other martial arts here

Kickboxing gyms are usually multi-discipline. Here's what else members mention training under the same roof at JSK 5.0 Humboldt Martial Arts and Fitness — mined from their reviews and the gym's own info.

🥊 Boxing

“They also have kick boxing and sparring classes too.”

Other gyms that also teach boxing →

🥋 Karate 2 mentions

“Shepard's karate class for almost a year, and we have been so impressed by the increase in their ability and their confidence.”

Other gyms that also teach karate →

🛡️ Self-Defense

“Self defense, discipline, and respect!”

Other gyms that also teach self-defense →

Disciplines are mined from reviews and the gym's own info — they show what members have trained, not a formal class guarantee. If you specifically want muay thai, boxing, or MMA alongside your kickboxing, confirm the current schedule with the gym.

What members say

The things reviewers bring up again and again across 19 Google reviews — in their own words.

🧠 builds confidence & relieves stress 2 mentions

“Kenpo is a good full contact art that is good for stress relieve and get in shape while learning how to be competent and confident in your ability to defend yourself.”

From the reviews

Mr. Shepard stands out as a remarkable kenpo instructor, offering patience and guidance to youth. His instructional services are highly recommended.

★★★★★ — Amber, Sep 2024

Excellent school to attend to begin your journey to martial Arts. Kenpo is a good full contact art that is good for stress relieve and get in shape while learning how to be competent and confident in your ability to defend yourself. Mr.

★★★★★ — David, Mar 2019

My son takes classes here and the owner Mr. Shepard is great. He has helped with my son's attitude and determination tremendously. I enjoy being able to watch the kids learn new and hone previously learned techniques. It's pricey, but worth it. The monthly membership doesn't include all the extra gi attire, etc.

★★★★★ — Serena, Jul 2019

I have been training in JSK 5.0 on and off for the last ten years. The quality of instruction and the detailed formation that you receive are top-notch. I have been helping Robert Shepard with this school for the last couple years, and I can contest that Mr.

★★★★★ — Nathan, Mar 2016

Excerpts from public Google reviews. Read all 19 reviews →

Your first kickboxing class at JSK 5.0 Humboldt Martial Arts and Fitness

Nervous about walking into a kickboxing gym for the first time? Almost everyone is, and good coaches expect beginners to come through the door. Here's what to know. What to expect: a typical first class is a warm-up, then drilling the basics — stance, footwork, and punches and kicks on pads or a heavy bag — not hard sparring. Go at your own pace and rest whenever you need to; no one will bat an eye. What to wear: comfortable athletic clothes you can move and sweat in, and supportive trainers. What to bring: water, and hand wraps and gloves if you have them — many gyms lend loaner gloves for a first class, so it's worth asking when you call. As you keep training you'll add your own gloves and wraps (and shin guards once you start sparring). Sparring is optional and eases in gradually, once your basics are solid. Arrive 10–15 minutes early to sign a waiver and meet the coach. It gets easier fast — most people feel far more at home by their third class.

Kickboxing is a contact sport. Warm up, pace yourself, listen to your coaches, and if you have any injuries or health concerns, mention them before class and check with a doctor if you're unsure.

Where to find JSK 5.0 Humboldt Martial Arts and Fitness

735 S Fortuna Blvd #737, Fortuna, CA95540

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Listing verified July 2026 from public business records and member reviews. Something out of date? Report a correction. Own this gym? Claim your listing — it's free.