fascia - InjuryMap, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons
muscles - Laboratoires Servier, CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons
muscle - Laboratoires Servier, CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons
Achilles tendon - J. Gordon Betts, Kelly A. Young, James A. Wise, Eddie Johnson, Brandon Poe, Dean H. Kruse, Oksana Korol, Jody E. Johnson, Mark Womble, Peter DeSaix, CC BY 4.0 <https://creativecommons.org/licenses/by/4.0, via Wikimedia Commons
dorsiflexion - Connexions, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0, via Wikimedia Commons
foot - Public Domain
feet - Public Domain
plantarflexion - Connexions, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0, via Wikimedia Commons
ankle - OpenStax College, CC BY 3.0 <https://creativecommons.org/licenses/by/3.0, via Wikimedia Commons
shoe drop - Modifyphysio, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons
tibia - Anatomography, CC BY-SA 2.1 JP <https://creativecommons.org/licenses/by-sa/2.1/jp/deed.en, via Wikimedia Commons
joint - Laboratoires Servier, CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons
barefoot - Pure male feet, CC0, via Wikimedia Commons
bone - Mikael Häggström, Public domain, via Wikimedia Commons
quadriceps - colorized by Michael Gasperl, Public domain, via Wikimedia Commons
heel drop - HLHJ, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons
pronation - InjuryMap, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons
hamstrings - Paul Hermans, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons
bones - Mikael Häggström, Public domain, via Wikimedia Commons
internal rotation - Tonye Ogele CNX, CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons
lordosis - Laboratoires Servier, CC BY-SA 3.0 <https://creativecommons.org/licenses/by-sa/3.0, via Wikimedia Commons
hip flexors - InjuryMap, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons
outer range - Mr. Yoga, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0, via Wikimedia Commons