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  • Athletics
  • Climbing
  • Cycling
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  • Fitness Classes
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  • Junior Gym
  • Outdoor Swimming
  • Swimming
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  • For the Girls
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  • Monthly Membership
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  • Day Pass
  • Lessons and Courses
  • Library Memberships
  • All Memberships
Find a leisure centre membership that matches your pace.
Join today
Man jogging on a treadmill in a gym.
Workouts and wellbeing tools as part of your leisure centre membership.
Live Better - Your health, your way
Woman stretching on a yoga mat in a studio, with others in the background.
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Find free and low-cost programmes to help you move more and feel better.
Support that fits you
Group of people wearing swim caps resting at the edge of a swimming pool.
Help your team stay active and healthy with workplace wellbeing solutions.
Wellbeing at work
Woman lifting a barbell in a gym.
About Us keyboard_arrow_down

About Us


  • A Charitable Social Enterprise
  • Our Story
  • Our Values
  • Careers
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Meet GLL, the charitable social enterprise behind Better and the communities it supports.
Behind Better
People high-fiving during a group fitness class in a studio.
Choose a career where your skills help people and communities feel better, healthier and more supported.
Give your passion a purpose
Swimming pool staff member standing beside an indoor pool.
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  4. Birthday Parties
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Birthday Parties

With loads of fun activities, your child’s sure to have a party that gets the whole playground talking; there really is something for everybody.

We’ll handle all the details and we’ll even take care of the cleaning up afterwards – so you can sit back, relax and enjoy your child’s special day with them.

Book your party at Better Gym Sleaford and choose from one of our 3 great packages and make it a day to remember!

Package 1

SOFT PLAY

A fun toddler play session, perfect for children aged 5 and under. This session is a great idea to celebrate your little ones birthday in a colourful and safe environment. Available between 12pm – 2pm Saturday (subject to availability). Suitable for up to 12 children.

Package includes: 1h of soft play, 1h in the studio.

Price: £80

Package 2

POOL PARTY

Session in the pool that is perfect for any swimming lovers. There is no better way to celebrate that special day than by splashing and playing around with friends. Available between 12pm – 2pm, Saturday & Sundays (subject to availability). Suitable for up to 15 children. Ratio of 1 adult to 2 children for swimmers under the age of 8.

Package includes: 1h of play in the pool, 1h in the studio.

Price: £100

Package 3

FOOTBALL

Use of our 5 aside 3G pitch for those budding footballers. Available between 12pm – 2pm, Saturday & Sundays (subject to availability). Suitable for up to 12 children.

Package includes: 1h of play in 3G Pitch, 1h in the studio.

Price: £60

MORE INFORMATION

Invitations
Invitations are available from reception only and can be collected at any time from any one of our staff members.

Party Information
The cost of the party includes 1 hour of activities & then 1 hour for food and drinks. 

Decorations
The party room can be decorated with balloons and birthday banners, you are welcome to bring your own decorations and set up prior to the party taking place. Please note we can only hang decorations with blue tack or cello tape, adhesive tabs cannot be used as this damages our paint work.

Party meal/Bags
Unfortunately we are unable to provide food from the centre. However, you are able to bring your own food and we can provide some tables and chairs to put food on.

Party hosts
Customers are not permitted to bring their own party entertainers unless authorisation has been given from one of our duty managers, along with proof of the entertainers DBS check and Public Liability insurance prior to the booking being made.

BIRTHDAY PARTY TERMS AND CONDITIONS

Please read the following carefully before commencing with your booking.

1.0 Administration
1.1 Terms and conditions are to be issued upon booking; the booking form needs to be completed in full.
1.2 Full payment is required upon booking.
1.3 The Birthday Party Administrator will require a minimum of 30 days notice in order to cancel your booking. A 15% administration fee will remain payable for any cancellation. Failure to provide 30 days notice may prevent a refund from being issued. In cases of sickness, a full refund, minus the administrative fee will be refunded as long as a doctor’s note is provided.
1.4 Payments are to be made at the centre, by cash, credit or debit card or cheque. Payments made by phone are not permitted.
1.5 The Birthday Party Administrator will require a minimum of 2 weeks notice for any changes to your booking. We regret that we will not be able to accommodate any changes made after this period.

2.0 General Party Rules
2.1 All customers should adhere to the Leisure Centres rules, which are displayed throughout the premises.
2.2 Please arrive for your birthday party 10 minutes before, and make yourself known to reception or a Duty Manager.
2.3 A Kids Activity Instructor may be provided dependent on type of birthday party and partnership booking.
2.4 The party activity will last 1 hour, with the remaining 30 minutes for food (where applicable).
2.5 Please ensure all attendees are aware of the times of the booking. We regret that we will be unable to alter times or provide extensions to your booking on the day.
2.6 Please inform the Birthday Party Administrator straight away of any change in numbers. If numbers go over ratios, another Kids Activity Instructor will need to be provided., which will incur an additional cost. The Birthday Party Administrator will need to be given at least 2 weeks notice if this is the case.
2.7 The Hirer will need to ensure that they have the contact details of all of the parents / guardians of the children in attendance for use in the event of an emergency
2.8 GLL cannot accept any liability for the loss, damage or theft of any items. Please take care not to leave belongings behind or unattended, and please do not bring valuables to the centre.
2.9 Use of cameras and video imaging equipment specifically within the party area and used by parents / guardians of children attending the party is permitted with the agreement of the General Manager
2.10 Alcohol is not permitted to be consumed within Children’s Birthday parties.
2.11 Some centres will allow customers to bring their own food on the day (please check with specific centre). GLL do not allow the use of heating devices brought from home in the centres.

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What We Offer keyboard_arrow_down
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What We Offer keyboard_arrow_down
  • Leisure Centres
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  • Venue Hire
  • Children's Centres
Contact & Support keyboard_arrow_down
  • Help Centre
  • Contact Us
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  • Terms and Policies
  • Sitemap
About Us keyboard_arrow_down
  • Our Story
  • Being a Charitable Social Enterprise
  • News
  • Careers
  • GLL Corporate Website
  • GLL Sport Foundation

Better is a registered trademark and trading name of GLL (Greenwich Leisure Limited), a charitable social enterprise and registered society under the Co-operative & Community Benefit & Societies Act 2014 registration no. 27793R. Registered office: Middlegate House, The Royal Arsenal, London, SE18 6SX. Inland Revenue Charity no: XR43398.

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