astor.academy / fitness / credits

Sources (28)

Every source cited in this course, in the order it first appears. Pages were read in October 2026.

  1. U.S. Department of Health and Human ServicesPhysical Activity Guidelines for Americans, 2nd edition (2018)
  2. CDCAdding physical activity as an adult
  3. Riebe et al., ACSM, Medicine & Science in Sports & Exercise (2015)Updating ACSM’s recommendations for exercise preparticipation health screening
  4. Mayo ClinicFitness program: 5 steps to get started
  5. American Heart AssociationTarget heart rates chart
  6. Mayo ClinicWalking: trim your waistline, improve your health
  7. National Institute on Aging (NIH)Three types of exercise can improve your health and physical ability
  8. NIAMS (NIH)Sports injuries: types, symptoms and risk factors
  9. CDCBenefits of physical activity
  10. American Heart AssociationWarm up, cool down
  11. NHS (UK)How to warm up before exercising
  12. CDCHow to measure physical activity intensity
  13. Paluch et al., The Lancet Public Health (2022)Daily steps and all-cause mortality: a meta-analysis of 15 international cohorts
  14. National Institute on Aging (NIH)Exercise and physical activity for older adults (booklet)
  15. Mayo ClinicExercise intensity: how to measure it
  16. Mayo ClinicStrength training: get stronger, leaner, healthier
  17. ACSM Position Stand, Medicine & Science in Sports & Exercise (2009)Progression models in resistance training for healthy adults
  18. NHS (UK)Strength exercises
  19. ACSM Position Stand, Medicine & Science in Sports & Exercise (2026)Resistance training prescription for muscle function, hypertrophy and physical performance in healthy adults: an overview of reviews
  20. NHS (UK)Balance exercises
  21. Garber et al., ACSM Position Stand, Medicine & Science in Sports & Exercise (2011)Quantity and quality of exercise for developing and maintaining fitness in apparently healthy adults
  22. Mayo ClinicStretching: focus on flexibility
  23. NHS (UK)Flexibility exercises
  24. NHS (UK)Get running with Couch to 5K
  25. CDCAbout sleep
  26. CDCAbout water and healthier drinks
  27. NIAMS (NIH)Sports injuries: diagnosis, treatment and steps to take
  28. CDCOlder adult activity: an overview