Stack Up App

Build modular workouts tailored precisely to your available time, equipment, and target goals. Stack Up replaces rigid, repetitive exercise plans with an intelligent training engine that stacks custom movement blocks into fresh, effective routines every single day. Whether you have ten minutes for a quick core blast or forty-five minutes for a full-body dumbbell circuit, the app assembles a balanced session so you can focus entirely on your reps. Build Custom Routines in Seconds Instant Routine Generator: Input your available time (10, 20, 30, or 45 minutes), muscle focus (Full Body, Upper Body, Legs, Core & Abs, Cardio), skill level (Beginner, Intermediate, Advanced), and available gear (Bodyweight, Dumbbells, Pull-up Bar) to generate a complete workout instantly. Physiological Block Ordering: Every generated session automatically stacks in safe, structured order—starting with a Total Body Warm-Up to prime your joints, moving into target main sets, and finishing with a recovery cool-down. Flexible Training Formats: Switch seamlessly between Straight Sets, Circuit loops, and HIIT Intervals. Smart Exercise Swaps: Instantly swap out any movement that causes discomfort or doesn't suit your mood without breaking the balance of your routine. Exercise Library and Active Guided Timer Movement & Block Library: Browse detailed exercise guides featuring clear technique steps and targeted muscle breakdowns—like Bicycle Crunches for rotational core strength—alongside popular pre-made blocks like Lower Body Burner and Core Crusher. Structured Programs: Access multi-day starter tracks, including the 7-Day Core Kickstart, 14-Day Full Body Reset, and 5-Day Cardio Burst. Guided Live Workout Timer: Follow an active workout screen equipped with high-contrast work/rest interval clocks, audio cues, and mid-session controls to adjust duration (+10s / -10s), skip moves, or add extra rounds on the fly. Consistency Log & Analytics: Monitor your active day streaks, weekly workout goals, and visual muscle focus graphs to ensure balanced development across every muscle group. On-Device AI Fitness Coach Get instant training guidance tailored directly to your home setup. Consult the private AI Coach to assemble specialized 20-minute leg sessions, find knee-friendly alternatives for heavy squats, calculate optimal rest intervals between sets, or combine cardio and strength training into a single quick workout.