Flux Workouts features.
One connected system.

PROGRESSION

Progressive Overload Tracker

Flux is a progressive overload tracker that advances your weights and reps automatically. Use double progression (rep ranges first, then load) or linear progression so you’re always training at the right intensity. 1RM entry and calculation from performance keep your numbers honest. No spreadsheets—the app handles progression so you can focus on lifting.

READINESS

Fatigue-Based Training & Recovery-Aware Sessions

Fatigue-based training is at the core of Flux. The app tracks systemic fatigue and per-muscle recovery so each session is tuned to how you actually feel. Subjective recovery and optional HealthKit data (sleep, HRV, RHR) feed into readiness. Flux includes fatigue modulation: live volume and intensity adjustments so you train hard when you’re ready and back off when you need to. It’s the workout app that changes based on sleep and recovery.

STRATEGY

Five Strength Periodisation Models

Choose Adaptive Block, Daily Undulating (DUP), Linear, Weekly Undulating (WUP) or Manual when generating a strength routine. The model shapes sets, reps, load, rest and effort targets. Managed progression follows completed training, not a fixed number of calendar days, with safety recovery when needed.

Move through adaptive phases, vary workout or weekly emphasis, follow a structured Linear build, or hold an eligible Manual phase. To change models, generate a new routine. Routine Library programmes keep their authored progression, and HIIT keeps its timed prescription.

HEALTH CONTEXT

HRV Workout Adjustments & HealthKit

HRV workout adjustments can use Apple Health data you choose to share. Available sleep, resting heart rate and HRV readings add recovery context to daily volume targets. Apple Health is optional: you can use Flux without sharing Health data, and data-dependent insights show only what is available. ML Readiness Simulation predicts RPE and adherence before you lift.

EQUIPMENT

Custom Gym Equipment Filter

The custom gym equipment filter makes every workout fit your setup. Create profiles for home gym, commercial gym, or limited equipment (e.g. hotel or minimal kit). The app selects exercises only from what you have, so you get a personalized lifting program that’s actually doable. Perfect for home gym owners and anyone who doesn’t have a full commercial setup.

ADAPTATION

Plateau Breaker Workout & Smart Exercise Selection

When progress stalls, Flux acts as a plateau breaker. Included Plateau Interventions use goal shifts, exercise swaps, and intensity boosters so you’re not stuck on the same plan. The Exploration Engine uses bandit-driven variety to prevent stagnation, and Adaptive Pathing learns which movements drive your progress while balancing favourites with the variety you need. Smart exercise selection gets more personal the more you use it.

NEW IN 8.6.0

Choose how Flux looks

Make Flux a place you enjoy coming back to. Pick System, Light or Dark in Profile → Theme. Your signed-in choice syncs with your Flux account, while System follows each device's appearance. Supported home widgets and Live Activities follow where iOS permits.

NEW IN 8.6.0

Understand your progress

See where your hard work is taking you. Strength, Health, Consistency and Velocity findings help you spot progress and understand the evidence behind it. Choose dates for Performance and Health, and review the recorded workouts linked to your current routine in Routine. Flux tells you when it needs more data.

NEW IN 8.6.0

Give each set its own target

Shape the session you want to train. Give individual sets their own targets in generated strength workouts, follow clearer warm-up and back-off details, and finish knowing what to aim for next. Routine Library programmes retain their authored progression.