Abs & Core: 28-Day Challenge

Abs & Core: 28-Day Challenge is a step-by-step core workout plan that starts easy and builds week by week. Kora, an animated guide, shows every move on screen, a voice coach calls out each exercise and rest, and a short daily session fits into a busy day. No equipment, no account and no subscription.

START WHERE YOU ARE
Pick Beginner, Intermediate or Advanced. Each level keeps its own 28-day progress. Every workout opens with a warm-up and ends with gentle stretches, and the plan builds in active-recovery days and rest days so the challenge grows with you instead of wearing you out. Day 28 is a finale that brings the month's moves together.

TOO HARD TODAY? MAKE IT EASIER
Most demanding moves have a gentler version. Tap "Make it easier" during a workout to swap a plank for a knee plank, flutter kicks for dead bugs or burpees for step jacks, and keep going without quitting the session.

A GUIDE FOR EVERY MOVE
27 bodyweight core moves, each animated by Kora and explained with clear steps and form tips: crunches, bicycle crunches, reverse crunches, leg raises, flutter kicks, dead bug, Russian twist, V-sit hold, hollow hold, plank, side plank, plank shoulder taps, mountain climbers, bird dog, glute bridge, reverse plank, cobra stretch, child's pose and more.

BUILT FOR A PHONE ON THE FLOOR
- Big timer digits and large buttons you can read from your mat
- Voice coach using your phone's text-to-speech voice, plus countdown beeps
- Get-ready countdown and adjustable rest between exercises, with +10 s when you need a breather
- Pause, skip or go back one exercise at any time
- Per-side moves are split into left and right automatically

YOUR OWN ROUTINES
Build custom workouts from any of the 27 moves, set the time or reps for each, reorder them and save as many as you like.

SEE YOUR PROGRESS
Day-by-day plan grid, current and best streak, weekly workouts and active minutes, and a history calendar. Log your weight and height to see your BMI and an approximate calorie estimate for each session.

REMINDERS THAT RESPECT YOU
Choose the days and time for a daily nudge. Reminders skip days you have already trained and are scheduled on your phone.

PRIVATE AND OFFLINE
No sign-up. Your progress, history and measurements stay on your device. Every workout runs without an internet connection; only ads need one.

HOW IT IS PAID FOR
Every workout, level and feature is included. The app shows banner ads outside workouts and an occasional full-screen ad after some finished workouts, never during an exercise. A one-time "Remove ads" purchase hides them for good.

DISPLAY AND ACCESSIBILITY
Light and dark themes, a reduce-motion setting, screen-reader labels for every demonstration, and kg/cm or lb/ft units.

IMPORTANT HEALTH INFORMATION
This app offers general fitness guidance. It is not a medical device and does not diagnose, treat or prevent any condition. Results vary from person to person. Talk to a doctor before starting a new exercise programme, especially if you are pregnant, injured or have a health condition, and stop if you feel pain or dizziness. Calorie figures are estimates.