Spot weak companies early.
Fix them fast.
Build predictable growth.
Your capital doesn’t just need hustle.
It needs muscle. It needs companies with Retention Strength.
You gain a clear view of what's working across your portfolio companies, and help your founders fix the problems that put value at risk.
Weak companies stop leaking customers. Strong companies accelerate. You
Weak form = weak returns
Every portfolio has the flashy company that looks strong in a pitch but struggles in practice to grow.
Lots of activity, little progress → busy work that doesn’t move key numbers.
Growth without retention → new customers don't stick and paid growth can't keep up with the churn.
Opinions over evidence → founders debate, while customers quietly saunter away.
Shiny pitch, shaky numbers → weak once due diligence tests the strength of the product to find, keep and grow revenue.
The impact: wasted capital, weaker exits.
Train for strength that sticks
At BehaviourGym, we don’t flex vanity.
We train portfolios to perform.
Diagnose leaks → see why customers really churn.
Plug churn → strengthen retention and customer word-of-mouth.
Build compounding growth → each cohort adds lifetime value.
Actions, not theory → one or two tests to show measurable impact in 30 days.
Our workouts aren’t guesswork, they’re built on proven behavioural systems that turn trial into habit, and customers into loyal cohorts.
How it works
Not theory. Not endless retainers.
3 ways to train your product into shape.
1.
Choose the challenge
Signups, churn, onboarding, retention.
Focus on the muscle that matters most.
2.
Workout sessions
Hands-on drills. Weak spots exposed.
Founders see leaks in behaviour, not just in spend.
3.
Action plan
One or two moves to test immediately.
Portfolio momentum without more headcount.
4.
Ongoing gains
Monthly or quarterly cycles. Strength that compounds.
Growth that sticks fund-wide.
The gains investors bank
Exit readiness
growth stories that stand up in raising due diligence.
→
Capital efficiency
every pound deployed lifts harder, compounds longer.
→
Higher valuations
stronger LTV:CAC drives healthier multiples.
→
Reduced burn, longer runway
sticky customers cut waste.
→
Sharper founders, faster pivots
strategy on data, not noise.
→
Why smart capital trains with us
Fractional muscle → senior behavioural science on tap, without adding headcount.
Speed → portfolio strength improvements you can see within 30 days.
Evidence-led → clear fixes grounded in behavioural science, explained in plain English
Accountability → clarity on which companies are building real strength, and which are just flexing (or skipping leg day).
GrowFit programmes for VCs and Venture Studios
Real world behavioural science, applied to boost your investment portfolio.
3 ways to get your founder teams and products into shape.
30 Days
Portfolio Sprint
Quick diagnosis. Clear fixes and early wins.
In 30 days we:
Review each company in the portfolio.
Run two live tests in-market.
Deliver a portfolio-wide risk map.
The result: early visibility, quick wins, and clear evidence you can share with LPs.
Best for funds who desire visibility across multiple companies.
Quarterly Cycle
The Compounding Plan
Sustained growth. Measurable strength.
Each quarter BehaviourGym:
Review portfolio companies for retention risks.
Run focused sprints to fix the biggest leaks.
Track progress with clear benchmarks at fund level.
The result: stronger companies, predictable growth, and fewer due diligence surprises.
Best for investors looking for steady gains quarter after quarter, not one-off wins.
Fully integrated. Always improving. On-tap expertise, without the headcount.
Long-term support. Flexible cost.
We act as your fractional behavioural science team:
On-tap expertise without the hiring headache.
Lower rates than adding senior headcount.
Practical fixes and guidance when you need them, not locked into bloated retainers.
The result: continuous behavioural science expertise at fund or company level, for a fraction of the cost of a hire.
Best for funds and scaleups who want senior support on demand, without building an in-house team.
Fractional Partner
The Embedded Expert
“Churn dropped 22% in the first sprint, finally, users are sticking.”
Product Lead, SaaS Scaleup
“We thought it was a product problem. BehaviourGym showed us it was a behaviour problem, and fixed it.”
Founder, Series A Startup
“The team now knows exactly how to spot and fix drop-offs. We’re sharper, faster, stronger.”
Head of Design, Fintech
