3 exercises that beginner should do

Pull-ups feel like progress. You can count them, film them, point at them. Dead hang, plank and wall sit look like you forgot to start — so almost nobody does them. All three together take under five minutes, and need nothing beyond a bar and a wall. This isn't an argument against pull-ups. It's why yours fall apart mid-set. A core that can't resist extension can't hold anything rigid. Shoulders that never hang at full length wear out. Knees that never get loaded at ninety degrees complain the second you try pistols. Dead hang first, three sets of 30 to 60 seconds. Plank, three sets of 30. Wall sit, two sets of 60. Daily. It's maintenance, not a workout.