FuelSplit

FuelSplit tells you two things Garmin doesn't show by default: how many calories you've actually burned through activity (not just sitting), and what type of fuel your body is using to do it. DAILY DASHBOARD See your active calories, goal completion %, and a live active/basal split bar. A motivational message (MOVE!, ON TRACK, or RELAX) tells you in real time whether your active calorie pace is ahead or behind where it should be. ENERGY SUBSTRATES Using established exercise physiology formulas (Swain, Karvonen, Romijn–Brooks crossover model), your heart rate history is analyzed to break down calories into: • Fat — your aerobic base fuel • Carbohydrates (CHO) — mixed intensity fuel • Glycogen — high intensity / anaerobic fuel Shown in grams, with concentric color-coded arcs. WHAT YOU GET • Page 1: Daily dashboard — active calories, goal %, active/basal split bar, and motivational message • Page 2: Substrate breakdown — total kcal with fat, CHO and glycogen arcs and grams • Page 3: 30-day ring — each day is a color-coded slice (green = goal met, orange = close, red = below), with overall calorie completion % in the centre • Page 4: Metabolic profile — long-term substrate averages, HRmax, resting HR and VO2max estimate Navigate with START button. BACK to exit. Long-press UP on Page 1 to set your daily calorie goal. Requires complete Garmin profile (weight, height, age, gender).

v1.64 The MOVE!/ON TRACK/RELAX message now paces itself against a 10pm (22:00) deadline for reaching your daily active calorie goal, instead of comparing against the whole day. Added Instinct 2/3 and Venu 2/3 support. Fixed a crash on fr935. App version now shown on Screen 3, below the completion %. v1.62 Screen 1 now shows Active + Basal + Total kcal together with the MOVE!/ON TRACK/RELAX message. Screen 2's substrate arcs are thicker with text repositioned for better balance. Screen 4's Total vs Active-only bars are now clearly labeled ("Tot"/"Act") and a bug was fixed where rest days incorrectly skewed the Active-only average. v1.6: Page 4 redesigned: substrate bars now show both your whole-day mix and your active-only (exercise) fuel mix side by side, each always summing to 100%. Added day markers (-7, -14, -21, -28) to the 30-day ring. Screen 1's active/basal bar is now thicker for better readability. v1.5: Reordered screens: daily dashboard with active/basal split bar and motivational message (MOVE!, ON TRACK, RELAX) is now Page 1. Substrate arcs moved to Page 2. 30-day ring now shows overall calorie completion %. New metabolic profile screen with substrate averages, HRmax, HRrest and VO2max. Peak HR tracked persistently across days. Substrate percentages always sum to 100% v1.4: Page 2 adds a live active/basal split bar with a motivational message based on your pace vs daily goal v1.3: Redesigned all screens: substrate arcs now fill edge to edge, Page 2 adds a live active/basal split bar, Page 3 becomes a 30-slice ring with overall calorie completion %, and substrate percentages now always sum to 100%. v1.2: Redesigned all screens: substrate arcs now fill edge to edge, Page 2 adds a live active/basal split bar, and Page 3 becomes a 30-slice colour-coded ring showing your last 30 days at a glance.