Calisthenics Exercise: Push-Ups To Add Muscle Mass & Reduce Skinny Fat, Workout At-Home (No Equipment)
Muscles Focus (1, 2, 3, 4): chest/pectoralis major and minor, arms/triceps, shoulders/deltoids, serratus anterior, core/abdominal/abs, back
*Add muscle mass, reduce skinny fat (lack of genetic muscle), build strength, and maintain muscle with more reps while increasing muscle endurance (tone)
*You can only maintain and tone muscles you already have (genetically and/or added via resistance/exercise)

*Here are more calisthenics exercises that add muscle mass to reduce skinny fat (lack of genetic muscle tissue)
References
- Wikipedia: Push-ups. https://en.wikipedia.org/wiki/Push-up
- Bezzad: All Push Ups Exercises: Your Guide to a Powerful Upper Body. https://www.bezzad.com/push-ups-exercises/
- Men’s Health: Calisthenics Athlete Chris Heria Shares His Daily 100-Pushup Workout, December 10, 2021, Emily Shiffer. https://www.menshealth.com/fitness/a38472048/chris-heria-calisthenics-100-pushup-workout/
- Hybrid Calisthenics: Pushup Progressions. https://www.hybridcalisthenics.com/pushups