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!
15/08/2026
Our popular Couch to CrossFit Course is already 70% full for September. Starting Wednesday 2nd September, 7:30-8:30pm.
Book now to avoid disappointment:
https://www.theboxportsmouth.com/couchtocrossfit
Reposting exciting happenings from
Designedly MOVE started with our kids & teens classes.
We love watching their confidence grow, skills develop and seeing them slowly realizing they’re capable of far more than they imagined.
Now we’re opening the door a little wider.
Our Designedly MOVEment is growing… and adults, you’re invited!!
Tomorrow we’re launching a simple challenge aimed to get everyone moving regardless of age, ability or location - celebrating progress together.
This is just the beginning. Are you in? Head over and follow for more info.
*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
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
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/
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)
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.
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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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
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?
| Monday | 6am - 10pm |
| Tuesday | 6am - 10pm |
| Wednesday | 6am - 10pm |
| Thursday | 6am - 10pm |
| Friday | 6am - 9pm |
| Saturday | 8am - 5pm |
| Sunday | 10am - 10pm |