Build Retention Strength from Day One.

Early Gains, Weak Form

Most teams put all their energy into what looks good from the outside:

• The pitch deck

• The demo

• The features

It all looks impressive on launch day.
But once customers try it, they don’t stay.

What really matters is Retention Strength

• Activation strength → Helping new users succeed quickly.

• Engagement → Keeping them coming back regularly.

• Retention power → Stopping the slow leaks over time.

• Revenue lift → Turning trials into paying accounts

When you lack retention strength, products get stuck between “looks promising” and “I can’t live without it!"

Train the Core Behaviours

Startups don’t think in quarters. They have mornings.

We run a Retention Strength Review of your product.

No jargon. No long reports. Just changes you can see working

• Triage leaks before they drain you. → know why customers drop off.

• Instant fixes → practical solutions you can apply quickly.

• Retention strength plan → repeatable methods your team can keep using.

One day. One measurable lift.

Assess. Train. Repeat

High intensity, short duration, real results.

We find the weak spots in your product: it might be activation, engagement, retention, or revenue.

You then choose what to focus on for your one day intensive.

On the day

Pinpoint. We'll uncover the ways you're losing customers.

Prep

Fix. You'll receive changes you can make straight away to grow users.

Measure. You get to see results in days, not quarters.

Start with your free
Strength Scan
Find the weak spots before you train the wrong product muscles.

What every startup hits

The patterns every founding team hits, and how we train through them.

Inbox overload = noisy roadmap

We help you sort by impact, not volume, so the fixes that matter most get shipped first.

→

Founder energy doesn’t scale

You can hand-hold 10 users. But not 1,000. We add in-product cues and guardrails so customers succeed without you.

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Momentum drops after setup

Users sign up, finish onboarding… then stall.
We add clear “what’s next” steps that keep people moving.

→

Trial → Paid feels uncertain

You’re never sure when to ask for money. We time upgrades to moments of proven value, so conversion feels natural.

→

Activation feels fuzzy

We define the first win, track it daily, and give your team a clear target.

→

Burnout sets in

Every week feels urgent, and progress feels invisible.
We work in short cycles: one focus, clear progress, so your energy is protected.

→

GrowFit programmes for StartUps

Fix leaky funnels instantly

One-Day Power-Up

Quick review, three live fixes, measurable lift.

Best for founders who need a fast proof point before the next board meeting.

Get fitter all round

Three-Day Tone-Up

Three Days across a month.
Three focused sessions in a month. We patch leaks, strengthen onboarding, and leave you with repeatable methods. Your product? Well fit.

Best for teams chasing a KPI boost without slowing product development.

We're on your team (fractionally), working for you to keep a continuous edge.

We join as an extra set of hands. Together we fix weak spots and build systems that compound after we step back.

Best for founders who want lasting growth habits.

Partnership

The Constant Coach

Hustle built it.
Muscle scales it.

Train the behaviours that make it stick.

Schedule a call

“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