How does the Apex OS Beta TDEE and Macro Calculator calculate daily caloric needs?

The calculator utilizes the scientifically validated Mifflin-St Jeor equation to compute Basal Metabolic Rate (BMR), factoring in weight, height, age, and sex. It then applies activity multipliers (1.2 to 1.9) and goal-specific caloric offsets (-1000 to +500 kcal) with optimized protein distribution (0.9g to 1.2g per lb of body weight).

How is the 7-Day Workout Split generated in Apex OS Beta?

The training engine dynamically builds an individualized 7-day schedule based on your training experience (Beginner, Intermediate, Advanced), focus (Upper, Lower, Full Body, Core, Cardio), equipment access, and specific muscle bias targets (e.g. Chest, Lat, Glute, Quad).

How does the US Navy Body Fat Calculator estimate body fat percentage?

The US Navy method uses precise circumference tape measurements of the neck, waist (and hips for females) in combination with height to calculate lean body mass and body fat percentage without requiring hydrostatic weighing or DEXA scans.

What is the Karvonen Target Heart Rate method?

The Karvonen formula calculates target aerobic training zones by taking into account Heart Rate Reserve (HRR = Maximum Heart Rate - Resting Heart Rate), providing more accurate conditioning thresholds than standard age-based formulas.

Who developed HQ Athletics Apex OS Beta?

HQ Athletics Apex OS Beta was engineered by Logan Peña, Creator & Lead Developer, as a complete athlete performance and protocol management system.

apex.hqathletics.com • BETA

4K Apex OS Beta

Guest Mode

Engineered by Logan Peña • Creator & Lead Developer

Apex OS Beta

The Precision Athlete Performance Operating System — Caloric needs, meal prep matrices, 7-day training splits & 8-week periodization.

Weekly Check-in

Record key metrics to track body composition trends over time.

Recovery & Readiness Signal

Calibrate training volume based on current recovery status.

Hydration logged today: 0 oz

Daily Caloric & Macro Targets

Mifflin-St Jeor equation calibrated with goal-specific metabolic multipliers.

Age

Gender

Weight (lbs)

Height (ft / in)

Activity Level

Training Goal

Interactive Meal Planner & Groceries

Build tailored meal options across 6 dietary regimes and generate shopping lists.

Dietary Preference

Allergies & Restrictions

Prep Complexity

Target Cals

—

Protein

—

Carbs

—

Fats

—

Preferred Protein (e.g. Steak, Tofu)

Custom Exclusions (e.g. Avocado)

Number of Meals

Include Low-Calorie Sweet Treat? (-200 cals)

Dynamic 7-Day Workout Split

Biomechanically-matched exercise matrix with customizable muscle biases.

Experience

Training Style

Exercise Layout

Cardio Modality

Append Post-Workout Cardio Finisher? (+10-15m conditioning)

Configure 7-Day Training Matrix

One-Rep Max Calculator

Epley formula intensity matrix.

Weight (lbs)

Reps (1-12)

US Navy Body Fat %

Circumference tape method.

Gender

Bodyweight

Neck (in)

Waist (in)

Hydration & Electrolytes

Fluid & mineral replenishment.

Weight (lbs)

Training (mins)

Target Heart Rate (Karvonen)

Custom aerobic training thresholds.

Age

Resting HR (BPM)

The Logan Peña Performance Blueprint

Creator & Lead Developer

"Elite body composition and strength do not happen by accident. HQ Athletics Apex OS Beta was engineered to eliminate guesswork — delivering the exact fueling mathematics, structured periodization, and recovery signals needed to realize your physical peak."

Check-in History

Review weekly weight, body composition, and sleep trends.

Date	Weight	Body Fat	Sleep	Action

HQ ATHLETICS™ APEX OS BETA · Engineered by Logan Peña · Performance equations and estimates for athletes. Consult a medical professional before beginning intense training.

Item added to your cart

Apex OS Beta

Daily Caloric & Macro Targets

Interactive Meal Planner & Groceries

Automated Grocery List

Dynamic 7-Day Workout Split

One-Rep Max Calculator

US Navy Body Fat %

Hydration & Electrolytes

Target Heart Rate (Karvonen)

The Logan Peña Performance Blueprint

HQ Athletics Pure Performance Line

Daily Caloric & Macro Targets

Interactive Meal Planner & Groceries

Automated Grocery List

Dynamic 7-Day Workout Split

One-Rep Max Calculator

US Navy Body Fat %

Hydration & Electrolytes

Target Heart Rate (Karvonen)

The Logan Peña Performance Blueprint

HQ Athletics Pure Performance Line

Calibrate Body Stats

Athlete Sign In

Log Strength PR

Recent PR Records

Check-in History

VIP Drop Waitlist

Print / PDF Options