Fortior

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The numbers behind your training

Plain-language guides to the strength, cardio, recovery and nutrition metrics in Fortior: what each one means, how it is worked out, and how to use it.

Strength

How Fortior estimates your strength, rates effort, suggests your next weight and counts your training.

Estimated one-rep max (e1RM)How your max is estimated from reps and reps in reserve, without testing it. RPE and reps in reserveRate how hard a set was, and why it changes your numbers. Progressive overload and your next weightHow Fortior picks the weight for your next set. Training volume: hard sets per muscleCounting the sets that matter for each muscle each week. Deloads: when to back offThe fatigue signals behind a deload suggestion. Bodyweight strengthPush-ups and pull-ups as a multiple of your bodyweight. Personal records and highlightsWhat counts as a real personal record.

Cardio

Heart-rate zones, training load and aerobic fitness, alongside your lifting.

Heart-rate zonesWhat each zone means and how Fortior sets them. Training loadLifting and cardio in the same week view. VO₂ max estimatesWhat the estimate is and where it comes from.

Recovery

Sleep, heart-rate variability and readiness, and how they shape your training.

ReadinessHow recent training, HRV and sleep become one daily read. Heart-rate variability (HRV)What HRV is, and why your own baseline matters most. Sleep and trainingTracking sleep next to your training.

Nutrition

Calories, macros, micronutrients and the fastest ways to log food.

Calories and macrosProtein, carbs and fat, and how calories add up. MicronutrientsVitamins and minerals in the foods you log. Logging foodBarcode, nutrition label, search, saved meals and photos. Water and supplementsLogging what you drink and take alongside your meals.

Body

Bodyweight, body composition and measurements over time.

Body compositionWeight, body fat and lean mass trends, and how to read them.

Guides

Step-by-step guides for getting more out of Fortior.

Switch from Strong or HevyBring your workout history into Fortior. Analyze your workouts with ChatGPT or ClaudeConnect your Fortior data to an AI tool, read-only.

Estimates are educational and based on your own logs. Fortior is not medical advice.