Changelog
Explore the iterative history of the Health Fitness API. Every endpoint shipped, metric added, and architectural enhancement — chronologically mapped for full transparency with our developer community.
v1.0.0 Major Release
March 5, 2026
Major release — 35 new advanced fitness intelligence endpoints, new direct enterprise platform at `api.hefitapi.com`, native multi-language support (8 languages), structured actionable responses with risk scores and recommendations. Transforms the API into a full-stack fitness intelligence infrastructure.
New (35)
- Added
/weekly-training-plan— intelligent 7-day splits with session focus, intensity zoning, and recovery blocks. - Added
/daily-training-plan— day-specific session programming with built-in warm-up and cool-down guidance. - Added
/macro-cycling— automatic training-day vs rest-day macro splits with metabolic adjustment intelligence. - Added
/hydration-electrolyte-plan— dynamic baseline + session-specific targets factoring ambient conditions. - Added
/glycogen-replenishment— precise carb timing, sodium guidance, and recovery fueling windows post-workout. - Added
/meal-timing-nutrient-distribution— goal-aligned schedules with optimized protein pulsing and peri-workout windows. - Added
/deload-automation— intelligent trigger detection and structured volume/intensity reduction templates. - Added
/workout-calorie-burn— activity-specific estimates with confidence intervals and environmental modifiers. - Added
/safe-progression-targets— weekly bodyweight and performance trajectories with medically-informed guardrails. - Added
/vo2max-estimation— field-test derived estimates (Cooper, 1.5-mile) with fitness classification and percentiles. - Added
/heart-rate-zones— Karvonen-style zones optimized for fat oxidation, aerobic threshold, or VO2 development. - Added
/strength-benchmarking— classification against population standards with compound lift ratio insights. - Added
/race-time-projection— 10K / half / full marathon forecasts from recent performances and mileage data. - Added
/daily-recovery-score— composite readiness metric from sleep, HRV, resting HR, and soreness with action steps. - Added
/cns-fatigue-index— central nervous system load tracking with neural recovery status and same-day stimulus guidance. - Added
/muscle-group-recovery-timeline— hour-precise retraining windows, overtraining alerts, and active recovery prescriptions. - Added
/adaptive-training-load— real-time "Push / Maintain / Pull Back" decisions based on readiness inputs. - Added
/weekly-checkin-analysis— interprets weight, strength, recovery, and adherence trends with adjustment recommendations. - Added
/weekly-volume-load-analyzer— hypertrophy-zone classification, distribution scoring, and overuse early-warning system. - Added
/longevity-score— composite metric (0–100) from VO2max, resting HR, body fat, sleep, and activity volume. - Added
/cortisol-stress-index— integrated nervous system stress scoring with overtraining and recovery warnings. - Added
/metabolic-adaptation-risk— flags adaptation risk during prolonged deficits with reverse-diet phasing guidance. - Added
/injury-risk-scoring— preventive focus areas and mobility interventions based on training load and history. - Added
/micronutrient-deficiency-flags— diet-pattern-based risk scoring (Vitamin D, Iron, Magnesium, B12) with food-first fixes. - Added
/sedentary-postural-risk— musculoskeletal and longevity impact scoring with daily mobility prescriptions. - Added
/body-recomposition-forecaster— predicts fat loss vs muscle gain trajectories with probability scoring. - Added
/insulin-sensitivity-estimator— metabolic health rating with carb-tolerance and lifestyle guidance. - Added
/neat-contribution-estimator— quantifies non-exercise thermogenesis burn and compensation risk. - Added
/reverse-diet-planner— structured calorie-ramping schedule to protect metabolism post-deficit. - Added
/plateau-breaker-logic— intelligent refeed, diet-break, and volume-manipulation strategies for stalled progress. - Added
/sleep-optimization-protocol— circadian-aligned recommendations based on consistency, caffeine, and evening habits. - Added
/running-economy-analyzer— efficiency scoring and lever-specific improvement suggestions. - Added
/mobility-limitation-scanner— joint-specific restriction severity with corrective warmup customization. - Added
/fasted-training-risk— quantifies muscle-loss and performance trade-offs with strategic alternatives. - Added
/training-personality-profiler— matches athlete style to ideal programming and burnout patterns.
Fixes (3)
- Launched new direct enterprise platform at
api.hefitapi.comwith full v1.0.0 feature set (RapidAPI contains only legacy endpoints). - Native multi-language support across all responses: English, Spanish, German, French, Portuguese, Japanese, Hindi, and Arabic.
- GET + POST support on every new endpoint for seamless integration into mobile, web, and backend workflows.
Deprecated (0)
No deprecations in this release.
v0.0.4 Expanded Feature Set
May 27, 2025
16 new endpoints across cardiovascular diagnostics, metabolic calculations, nutrition/macronutrients, and diet/lifestyle tools. Focus on clinical and diagnostic calculators for health platforms.
New (16)
- Added
/qtc-calculator— Corrected QT Interval with multiple formulas (Bazett, Fridericia, Framingham, Hodges). - Added
/abi-calculator— Ankle-Brachial Index for peripheral artery disease assessment. - Added
/aortic-valve-area— AVA calculation via continuity equation estimation. - Added
/six-minute-walk-test— Functional exercise capacity assessment. - Added
/rmr-calculator— Resting Metabolic Rate (Mifflin-St Jeor, Harris-Benedict). - Added
/katch-mcardle— BMR based on lean body mass. - Added
/maintenance-caloriesand/meal-calories— Macronutrient-based calorie estimation. - Added
/fat-intake,/protein-calculator,/carb-calculator— Daily macro targets. - Added
/fiber-calculator,/net-carbs,/simple-sugar,/sodium-in-salt— Nutrition detail tools. - Added
/weight-watchers-points— Smart Points calculation (calories, sugar, sat fat, protein).
Fixes (0)
No fixes in this release.
Deprecated (0)
No deprecations in this release.
v0.0.3 Expanded Feature Set
March 2025
17 new endpoints covering body composition indexes, cardiovascular risk assessment, metabolic health markers, and unit conversions. Added GET & POST support across the board.
New (17)
- Added
/ponderal-index,/body-roundness-index,/geriatric-bmi— Advanced body composition metrics. - Added
/karvonen-formula— Target heart rate zones for training. - Added
/lean-body-mass(Boer formula),/body-surface-area(multiple formulas). - Added
/daily-vitamin-calculator— Age/gender/lifestyle-based vitamin targets. - Added
/keto-calculator— Macronutrient ratios for ketogenic diet planning. - Added
/blood-sugar-converter— mmol/L ↔ mg/dL conversion. - Added
/diabetes-risk— 7.5-year Type 2 diabetes risk assessment. - Added
/homa-ir(insulin resistance),/quicki(insulin sensitivity). - Added
/cholesterol-ratio,/cholesterol-units-converter,/triglycerides-converter,/vldl-calculator,/ldl-calculator— Lipid panel tools.
Fixes (3)
- All endpoints now support both GET & POST requests for maximum integration flexibility.
- Added metric & imperial unit support where applicable.
- Enhanced response accuracy and error handling across all endpoints.
Deprecated (0)
No deprecations in this release.
v0.0.2 Expanded Feature Set
Early 2025
8 new endpoints covering military body fat standards, energy expenditure calculations, and micronutrient requirements.
New (8)
- Added
/us-army-body-fatand/us-navy-body-fatcalculators. - Added
/estimated-average-glucose(eAG) calculator. - Added
/estimated-energy-requirement(EER) and/total-daily-energy-expenditure(TDEE). - Added
/basal-energy-expenditure(BEE) and/total-energy-expenditure(TEE). - Added
/micronutrient-requirements— Vitamins & minerals reference values.
Fixes (0)
No fixes in this release.
Deprecated (0)
No deprecations in this release.
v0.0.1 Initial Release
Late 2024 / Early 2025
Foundational launch — core body composition, metabolism, hydration, and fitness benchmark endpoints. Establishes the baseline health and fitness API toolkit.
New (13)
- Core metrics:
/absi,/adjusted-body-weight,/bai,/body-frame-size,/bmi,/body-fat-percentage. - Metabolism:
/bmr(Basal Metabolic Rate),/daily-caloric-needs. - Hydration:
/daily-water-intake. - Fitness:
/ffmi(Fat-Free Mass Index),/target-heart-rate. - Nutrition:
/macronutrients-distribution,/ideal-body-weight.
Fixes (0)
Initial release — baseline launch.
Deprecated (0)
No deprecations in this release.
Changelog FAQs
How often is the Health Fitness API updated?
We release updates based on community feedback, new endpoint research, and infrastructure improvements. Major releases introduce new fitness intelligence modalities and endpoint expansions, while minor patches focus on stability and performance.
How do I get the latest version?
If you're using the API through api.hefitapi.com, you're always on the latest version — updates are deployed server-side with zero downtime. No client-side changes are needed.
Are older endpoint versions still available?
Yes. We maintain backward compatibility for standard health and fitness calculations. New interpretations, expanded metrics, and additional endpoints are additive and won't break existing integrations.
How can I contribute a feature request or report a bug?
Open an issue on our GitHub or reach out through our contact page. We welcome community input on endpoint behavior and metric accuracy.
What does the version numbering mean?
We follow semantic versioning conventions. Major version bumps (1.0.0) indicate significant platform expansions. Minor versions (0.x.0) cover endpoint additions. Patch versions (0.0.x) cover fixes and performance improvements.
Are migration guides provided for breaking changes?
Yes. When a release introduces changes that affect existing integrations, migration guidance is included in the release notes and linked from the documentation.
What is the deprecation policy for endpoints?
Endpoints are not removed without advance notice. Deprecation announcements appear in the changelog and documentation well before any removal takes effect.
Can I subscribe to release notifications?
Yes. Follow us on X (@dakidarts) or check this changelog page regularly for the latest updates. Enterprise customers receive direct release notifications.