The Box Portsmouth / CrossFit Portsea Island

The Box Portsmouth / CrossFit Portsea Island Specialist Fitness Facility for CrossFit & Dance Enthusiasts in Portsmouth, UK. Home to CrossFit Por The venue has been open since September 2013.

The Box - Portsmouth is a specialist CrossFit and Dance fitness venue run by Carl Marsh & Claire Hamer. Facilities include:

- CrossFit Portsea Island - Portsmouth centre's first CrossFit affiliated gymnasium
- The Box Studio - a state of the art dance/fitness studio

as well as the Snack in the Box, sports massage/treatment room, lounge, showers, toilets and changing areas. For further details email [email protected] or pop in and see us!

13/05/2026

*MOVE Kids & Teens Fitness Classes*

We have expanded & rebranded our fitness classes for children from the age of 5 years upwards - Designedly MOVE Kids & Teens.

Each class offers a broad, general and inclusive 45 minute session in which children will learn the fundamental movements of CrossFit.

With an emphasis on FUN, good movement patterns are taught to the participants which help produce good physical literacy and enhanced sports performance.

Each class caters to the specific developmental needs of the children and is progressively structured in accordance with our MOVE Kids Awards Programme

Mon 4:40-5:25pm - MOVE Kids (5-8 years) - spaces
Tue 4:30-5:15pm - MOVE Teens (lifting focused) - spaces
Wed 4:30-5:15pm - MOVE Pre-Teens (9-12 years) - spaces
Sat 8-8:45am MOVE Kids (5-12 years) - full
Sat 10-11am - MOVE Teens - last spaces

To book a trial class for £7 visit :
https://www.designedly.co.uk/move

26/04/2026

A Strong Sunday with a difference!
Members decided to surprise Coach Dave by turning up in anything but activewear for their session. And proceeded to make him wear a cheerleading outfit.

Complete community carnage. Just the way we like it.
Well done all who got involved. It looked like a super fun session and certainly got a fair few onlookers wondering what was going on 🤣

Thankyou to for the inspiration

Our Couch to CrossFit course is back for April and kicks off tomorrow (Friday 3rd 7pm)!Some spaces are still available f...
02/04/2026

Our Couch to CrossFit course is back for April and kicks off tomorrow (Friday 3rd 7pm)!
Some spaces are still available for those keen to transform across the Easter break.

Sign Up link in the bio as well as below:
https://www.theboxportsmouth.com/

09/03/2026

Here is some footage from CrossFit Open Workout 26.2. Those that haven’t completed it can jump into our last chance saloon class this evening 6:30-7:30pm.

Well done to all athletes that have it in the books already!

Which one have we all preferred 26.1 or 26.2?

Did anyone else manage to string 13 C2bs together and 7 MUs like our Coach Dave through the workout? (Watch till end)

01/03/2026

Well done to our all athletes who have taken part in the CrossFit Games Open Workout 26.1 so far!

Here are some snippets from our Friday Night Lights event as well as our MOVE teens class.

Great scores coming in from such a challenging workout:
For time:
20 wall-ball shots
18 box jump-overs
30 wall-ball shots
18 box jump-overs
40 wall-ball shots
18 medicine-ball box step-overs
66 wall-ball shots
18 medicine-ball box step-overs
40 wall-ball shots
18 box jump-overs
30 wall-ball shots
18 box jump-overs
20 wall-ball shots

Time cap: 12 minutes

Not completed it yet but want to?
We have a last chance saloon class at 6:30pm on Monday! Come along and get involved.

We are delighted to announce an exciting opportunity for aspiring younger leaders in our teen community. The Box Portsm...
26/11/2025

We are delighted to announce an exciting opportunity for aspiring younger leaders in our teen community. The Box Portsmouth is now offering a nationally recognised Level 1 Qualification in Sports Leadership.

At present we are only offering this opportunity to our current youth fitness members. The course is perfect for young enthusiasts who are passionate about sports and looking to take on leadership roles in their schools, clubs and communities and serves as an ideal stepping stone for those interested in careers in sports, education, or coaching.

A Level 1 Sports Leadership qualification is a foundational course designed for young people aged 13+ to develop leadership skills through practical sport and physical activity. Learners will gain skills in communication, organisation, and planning, enabling them to assist in leading simple activities under supervision. The qualification provides a nationally recognised starting point that builds confidence and can help progress to higher-level courses

We believe that fostering leadership in young athletes is crucial for developing not only sports skills but also essential transferable life skills.

Linked Photo is of coaches Claire Marsh .uk and Emma Walker completing their tutor and internal verifier training to be able to deliver the course.

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13/11/2025

On Tuesday (& in our mum & baby class today) our adult members took on the hero workout “Chad” which is 1000 weighted step ups for time.

The workout was written in honour of Navy Seal Chad Wilkinson who took his own life due to the effects of numerous deployments, several TBIs, blast wave injuries and PTSD.

Well done to all our members who pushed through with it. A true test of mental as well as physical resilience.

The workout was completed on Remembrance Day as we paid tribute to one of our own - Adam Salmon - who sadly lost his own mental health fight earlier this year.

Adam, you are deeply missed mate x

03/11/2025

After a long hiatus we are delighted to be bringing back kids streetdance to our facility. Classes will run for 7-12 year olds every Thursday 5:30-6:15pm starting this week. The sessions will be teaching general hip hop at a beginner level. Our dance inspired theme for November is the ever so popular Kpop Demon Hunters.

A trial class is £7 with monthly memberships thereafter. You can book a space by visiting our website:
www.theboxportsmouth.com/kids-streetdance

Bonus points for anyone guessing what year the first picture was taken of one of The Box Portsmouth former street dance crews?

Are you ready to level up your fitness? Join our CrossFit classes, where EVERYONE is welcome! Whether you’re a seasoned ...
18/10/2025

Are you ready to level up your fitness? Join our CrossFit classes, where EVERYONE is welcome! Whether you’re a seasoned pro or just starting out, our workouts are designed to be scaled for ALL abilities. You’ll get the same muscle stimulus and benefit from amazing community support, no matter where you are on your fitness journey!

Plus, we’re excited to announce that our final Couch to CrossFit course of 2025 kicks off in November! Don’t miss out—spots are limited! Book today: www.theboxportsmouth.com

Last chance to book onto our May Couch 2 CrossFit Course. It starts this bank holiday Monday 7:30-8:30pm and runs every ...
03/05/2025

Last chance to book onto our May Couch 2 CrossFit Course. It starts this bank holiday Monday 7:30-8:30pm and runs every Mon, Wed & Fri for 12 sessions. Costs £85 and is a great way to steadily build your fitness & confidence prior to joining our regular CrossFit classes.

Spaces still available. Book now:
https://www.theboxportsmouth.com/couchtocrossfit

Address

235/237 Commercial Road
Portsmouth
PO14BJ

Opening Hours

Monday 6am - 10pm
Tuesday 6am - 10pm
Wednesday 6am - 10pm
Thursday 6am - 10pm
Friday 6am - 9pm
Saturday 8am - 5pm
Sunday 10am - 10pm

Telephone

+447971755579

Website

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