Teen bodyweight starter, no gear

I'm under 18 and new to exercise with no equipment. Give me a 25-minute beginner bodyweight session built around push-ups, bodyweight squats and planks, with easier and harder versions of each so I can pick my level. Warm-up (5 min): march in place, arm circles, 10 bodyweight squats, 10 shoulder taps, 5 slow inchworms. Main circuit (3 rounds, ~12 min): push-ups x 8-10 (scale: against a wall or on knees if needed), bodyweight squats x 12, plank hold 20-30s, glute bridge x 12. Rest 60s between rounds and work at an effort where I can keep good form and still talk in short sentences. Finish (3 min): easy stretching. For each exercise give me 2 form cues and the easier/harder progression, and tell me when to move up a level. No jumping or equipment required.