TUMBL×HARD&SMART
Now full · Waitlist open

Back at Oasis.

Ninety minutes of coaching at Oasis with Hard&Smart Coaching and we film you while you're in the water. You go home with the footage of your own stroke and access to personalised analysis of what to change. All twelve spots have now gone.

When
Sun 18 Oct, 9.30am
Where
Oasis, Covent Garden
Price
£45
Spots
12
Join the waitlist

This one's full. Please join the waitlist and we'll email you if a spot opens up.

12
Swimmers
2
Coaches
90min
In the water
Video
Of your stroke
What you take home

See your own stroke, and what to do about it.

We film you during the session. Upload the footage to Tumbl afterwards and you get personalised analysis back, with stills from your own swim marked up so you can see exactly what we mean.

The Tumbl app showing written analysis of a swimmer's breathing, with annotated stills from their own stroke underneath
The morning

Coaching, and video you keep.

Meet at the Oasis entrance for 9.15am and we'll be in the pool for 9.30am, finishing around 11am.

90 minutes of coaching

Freestyle technique with Charlotte and Greg. Small groups by pace, so you're swimming alongside people at your level.

Video of your stroke

We film everyone in the water and you leave with the footage on your phone.

A free upload on Tumbl

We'll give you a code to unlock an upload, so you can send us your session video and get personalised written feedback on it.

Who it's for

Adults who can swim and want to swim better.

This one is aimed at beginner to intermediate swimmers. If you can cover 50m of freestyle without stopping, you'll be in good company.

Not sure whether it's right for you? Email hello@tumblswim.com and we'll work it out with you.

Your coaches

Two coaches on poolside.

Charlotte Bell

Tumbl

Former junior elite swimmer. Swim England and BTF triathlon coach. 25 years in the water and 6 years coaching.

Greg Divall

Hard&Smart

Triathlon coach. Two-time GB Age Group triathlon world silver medallist.

From the May session

What swimmers said last time.

Everyone who came in May rated it five out of five, and every one of them said they would come back. See how the morning went.

“It was amazing to come away from a session with clear things to work on. The coaching was brilliant: very clear instructions, and I loved that they targeted different parts of the catch and pull. I really, really loved speaking to people who also love swimming. It feels like a really nice community could be built through sessions like today.”
Swimmer · Tumbl launch event, May 2026

“Fantastic coaching. Love the expertise and the good mood Charlotte brings.”

Swimmer · May 2026

“Meeting new people and learning useful hints about my technique.”

Swimmer · May 2026

“As a coach it was great to see other coaches doing something they're clearly passionate about. Well planned, well delivered, with just enough to take home without feeling overloaded.”

Visiting coach · May 2026

“Really good vibes from everyone.”

Swimmer · May 2026
Before you join

A few things worth knowing.

Where is it?
Oasis Sports Centre, 32 Endell Street, WC2H 9AG. Covent Garden and Holborn tubes are both a short walk.
What time should I arrive?
Meet us at 9.15am by the Oasis entrance. We'll all head in together so nobody's stood on their own. In the pool for 9.30am sharp.
How does the waitlist work?
Add your name to the waitlist and we'll email you when a spot is confirmed. You'll have 24 hours from that email to pay, and once it's through the spot is yours. We'll always tell you where you stand.
What do I need to bring?
Your usual kit: costume, cap, goggles, towels. Plus any pool toys you use (fins, pull buoy, kickboard). If you don't have pool toys, don't worry.
I'm not sure I'm the right level.
This one is aimed at beginner to intermediate swimmers. Not sure whether that's you? Email hello@tumblswim.com and we'll help you work it out.
Will I be in a group or 1-to-1?
Small groups. Twelve swimmers across two coaches means around six per group, split by pace.
What happens with the video afterwards?
It's yours. You'll walk away with footage on your phone, and we'll give you a code to unlock a free upload on Tumbl. Send the video over and you get personalised written feedback on it.
Now full · Waitlist open

Come and swim with us.

This one's full. Join the waitlist and we'll email you as soon as a spot opens up.

Join the waitlist

£45 for the morning. Twelve spots, offered in waitlist order.