Health NestEgg =
1 − (1 − Dose) × (1 − Fitness)Dose = target × maturity
Maturity =
1 − e−weeks/52Fitness Bonus =
+3% per Challenge | Scenario | Dose | Fit. | Total |
|---|---|---|---|
| L1+Str · 52wk · 0Ch | 26% | 0% | 26% |
| L1+Str · 52wk · 4Ch | 26% | 12% | 35% |
| L1+Str · 104wk · 4Ch | 35% | 12% | 43% |
| L4+Str · 208wk · 4Ch | 45% | 12% | 52% |
How to Use the Health NestEgg Calculator
The Health NestEgg Calculator shows you a simple thing: how much estimated protection against chronic disease and premature death you build up from the exercise habit you maintain through NestEgg. It’s a visualization of your Health NestEgg — the protective effect of a sustained, dose-measured activity habit across nine conditions including cardiovascular disease, type 2 diabetes, dementia, depression, and several cancers.
Think of it as a financial planner for your health. You make weekly deposits. Over time, the NestEgg grows.
The three inputs
| Input | What it means |
|---|---|
| Deposit Level | The weekly dose you’re holding. Choose from Inactive, L1 Aerobic (WHO minimum, ~150 EP/week), L1 + Strength, L4 Aerobic (WHO ideal dose), or L4 + Strength. |
| Health Balance | How many consecutive weeks you’ve been hitting that Deposit Level. Drag 0 → 208 weeks (four years). Protection matures exponentially: ~63% of the full benefit after 52 weeks, ~93% after 140 weeks. |
| Challenges (past 12 months) | How many NestEgg Challenges you’ve completed in the last year. Each one adds a small cardiorespiratory-fitness bonus. |
What the dial tells you
| Output | Meaning |
|---|---|
| Exercise Dose Protection | Risk reduction earned by your sustained weekly dose × how mature that habit is. |
| Fitness Bonus Protection | The extra reduction from fitness gains earned during Challenges. |
| Total Health NestEgg | The two combined: 1 − (1 − Dose) × (1 − Fitness). This is the number in the ring. |
How to read the result
Drag the sliders and watch the ring fill. A couple of useful reference points:
- L1 Aerobic, 52 weeks, 0 Challenges → around 20% — the value of simply showing up consistently.
- L1 + Strength, 140 weeks, 2 Challenges/year → around 42% — the sweet spot most Eggs can reach. Two strength sessions a week at beginner level matter more than chasing L4 alone.
- 30%+ is the threshold where the reduction becomes actuarially meaningful — the point an insurer would take notice.
Reference Data
The numbers come from peer-reviewed meta-analyses of observational cohort studies (Arem et al. 2015, Momma et al. 2022, Saeidifard et al. 2019, and others). They describe population-level associations, not causal guarantees for any one person. Read the result as a directionally accurate projection of what a sustained habit tends to deliver — not a medical prediction.
Move the sliders. See what four years of small, steady deposits is worth.