JESS MOVEHow it works
The engine
Every candidate moment is scored. Below the threshold the system says nothing at all — silence is a valid, logged outcome. Above it, you get one Snap of 90–300 seconds, matched to the body you actually have and the room you are actually in.
Step one
Seven factors multiply and three penalties subtract. Everything is normalised to 0–1 so no single large input can dominate, and safety confidence sits in the multiplied half — a zero there kills the recommendation regardless of how good the moment otherwise looks.
score = (availableTime × sedentaryDuration × readiness × environmentalSuitability × safetyConfidence × completionProbability × personalBenefit) − mean(interruptionCost, socialAwkwardnessRisk, fatigueRisk)
Step two
The engine does not wait for a timer to run out. It builds a model of your day from calendar structure, device inactivity, wearable signal and — where you have enabled them — commute pattern, weather and location category.
Step three
No agent may take another agent’s decision. Safety can only narrow. Recovery can veto the whole day. Accessibility rewrites the experience rather than adding an alternative link at the bottom.
Builds a living model of the day
Selects the single most suitable activity
Finds inactivity trends, not just timer expiry
Learns why a person accepts, ignores or abandons a prompt
Screens every activity before it reaches a person
Transforms the experience to the individual
Generates missions, rewards and challenges
Stops the platform becoming intrusive
Builds inclusive group competition
Produces anonymised organisational insight
Connects generations through shared activity
Detects disengagement before abandonment
Step four
Asserted in continuous integration. A build that scores movement on calories, weight or appearance does not ship.
Participation + Consistency + Improvement + Mutual support. Physical capability is absent by design — that is what lets a ten-year-old, a wheelchair user and an eighty-eight-year-old share one leaderboard fairly.
Weight, and control of it
For adults, supporting weight management is a primary aim of the platform. What the product refuses to do is decide on your behalf that a lower number is the goal, or make that number the thing you are measured against in public.
Reduce, Waist, Maintain, Recomposition, Gain, Child Growth, Older-Adult Independence, Limited Mobility, Professional Support.
No weight, BMI, calorie or appearance framing, in any mode, under any consent setting.
The full pathway model, the safety gate and the scorecard are documented on Body Balance.
The engine reads the shape of your calendar, not its contents, and finds the gaps that are actually movable. It needs your week to show you anything.
Free to create. 150 AI credits a month for 2 months, then AI features need a plan — everything that is not AI carries on either way. Premium is £5.99 a month and cancels in one click. Under 18 a guardian confirms before the account opens.