https://www.puregym.com/exercises/full-body/mountain-climbers/#:~:text=As%20a%20compound%20exercise%20that,help%20you%20burn%20more%20calories.
https://www.masterclass.com/articles/glute-bridges-guide#:~:text=A%20glute%20bridge%20is%20an,stability%2C%20and%20lower%20back%20health.
https://www.guinnessworldrecords.com/world-records/698423-most-tuck-jumps-in-one-minute-male#:~:text=The%20most%20tuck%20jumps%20in,USA%2C%20on%2026%20November%202022.
https://www.wellandgood.com/hardest-no-equipment-exercises/
https://www.thegymgroup.com/exercises/total-body-exercises/how-to-do-an-inchworm/
https://www.guinnessworldrecords.com/world-records/111725-heaviest-weight-lifted-in-one-hour-kettlebell-swing#:~:text=The%20heaviest%20weight%20lifted%20by,kg)%20versions%20of%20this%20title.
https://www.sfgate.com/bayarea/slideshow/Bay-Area-folks-in-the-Guinness-Book-of-World-135105.php#:~:text=Longest%20Wall%20sit%20ever%3A%20Dr,Dr.
https://www.wellandgood.com/hardest-no-equipment-exercises/
https://www.topendsports.com/testing/tests/20mshuttle.htm
https://www.healthline.com/nutrition/farmers-walk-benefits#:~:text=The%20farmer's%20walk%2C%20also%20called,providing%20an%20excellent%20cardiovascular%20stimulus.
https://www.healthline.com/health/sled-push#:~:text=Load%20the%20sled%20with%20a,to%20high%2Dgrip%20hand%20position.
https://www.guinnessworldrecords.com/world-records/646641-highest-seated-box-jump#:~:text=The%20highest%20seated%20box%20jump,capabilities%20of%20the%20human%20body.
https://www.americansportandfitness.com/blogs/fitness-blog/build-strong-and-sexy-legs-the-top-10-benefits-of-bulgarian-split-squats#:~:text=Bulgarian%20split%20squats%20are%20an,much%20easier%20than%20regular%20squats.
https://www.atreq.com/blogs/news/5-things-you-need-to-know-about-battle-ropes#:~:text=Studies%20have%20suggested%20that%20after,up%20muscle%2C%20power%20and%20endurance.
https://www.muscleandfitness.com/workouts/workout-tips/10-toughest-exercises-master/
https://barbend.com/jefferson-deadlift/
https://www.cnn.com/2023/10/08/sport/kelvin-kiptum-mens-marathon-world-record-chicago-spt-intl/index.html#:~:text=Kelvin%20Kiptum%20set%20a%20new%20world%20record%20at%20the%20Chicago%20Marathon.&text=Kenya's%20Kelvin%20Kiptum%20broke%20the,in%202%3A00%3A35.
https://www.guinnessworldrecords.com/world-records/most-consecutive-muscle-ups#:~:text=The%20most%20consecutive%20muscle%20ups,China%2C%20on%2018%20January%202023.
https://www.wellandgood.com/hardest-no-equipment-exercises/
https://www.guinnessworldrecords.com/world-records/664411-longest-time-in-an-l-sit-female#:~:text=The%20longest%20time%20in%20an,own%20record%20by%205%20minutes.
https://bodyweighttrainingarena.com/manna-progression/#:~:text=Start%20by%20sitting%20on%20the,give%20you%20great%20core%20balance.
https://www.exercise.com/learn/top-10-hardest-exercises-ever/
https://www.masterclass.com/articles/hanging-leg-raises-guide#:~:text=With%20proper%20form%2C%20hanging%20leg,muscles%20while%20increasing%20grip%20strength.
https://en.wikipedia.org/wiki/The_World_Log_Lift_Championships#:~:text=Savickas'%20last%20world%20record%20was,final%20in%20Scotland%20(Glasgow).
https://superleaguetriathlon.com/training/when-it-comes-to-picking-a-triathlon-to-take-part-in-you-also-have-a-choice-of-distances/#:~:text=If%20you've%20ever%20watched,40km%20bike%20and%2010km%20run.
https://thesuperhumanfitness.com/bodyweight-exercises/aztec-pushup-toughest-pushup/
https://www.guinnessworldrecords.com/world-records/109412-fastest-50m-rope-climb#:~:text=The%20fastest%2050%20m%20rope,attempt%20at%20setting%20this%20record.
https://parkour.sport/history.php#:~:text=The%20Parkour%20adventure%20began%20in,who%20was%20a%20Parisian%20firefighter.
https://fitnessprogramer.com/15-hardest-exercises/#google_vignette
https://www.scouts.org.uk/activities/human-knot/#:~:text=Sometimes%20it's%20impossible%2C%20or%20there,t%20untie%20the%20human%20knot.
https://www.vulyplay.com/en-AU/blog/6-amazing-trampoline-world-records#:~:text=Most%20flips%20on%20a%20trampoline%20in%20one%20jump,-Ernest%20Brenchley%20from&text=Ernest%20did%208%20backflips%20and%20landed%20on%20his%20knees.
https://www.isellfitness.com/en-ca/products/atlas-stones#:~:text=ISF%20Atlas%20Stones%20are%20built,%2C%20glutes%2C%20and%20the%20back.
https://www.optimyz.com/prisoner-get-ups-for-a-small-room-workout/
https://goldenbookofworldrecords.com/archives/8796#:~:text=The%20World%20Record%20of%20'fastest,seconds%20(01M%3A21S).
https://allaboutslackline.pt/en/trickline/#:~:text=Trickline%2Cthe%20sport%20that%20defies%20gravity,-Slackline%20is%20a&text=The%20trickline%2C%20practiced%20on%20beaches,them%20into%20ever%20larger%20sequences.#
https://themovementathlete.com/planche-injury-prevention/#:~:text=There%20are%20different%20hand%20placements,holding%20a%20ton%20of%20pressure.
https://en.wikipedia.org/wiki/Bent_press#:~:text=Moines%20Strength%20Institute-,Records,409.5%20pounds%20(185.7%20kg).
https://fitnessprogramer.com/15-hardest-exercises/#google_vignette
https://www.exercise.com/learn/top-10-hardest-exercises-ever/
https://en.wikipedia.org/wiki/Front_lever#:~:text=Front%20levers%20require%20a%20high%20degree%20of%20back%20and%20core%20strength.&text=The%20move%20is%20rated%20A,F%20being%20the%20most%20difficult.
https://worldathletics.org/disciplines/combined-events/decathlon#:~:text=An%20all%2Dround%20athletics%20test,pole%20vault%2C%20javelin%20and%201500m.
https://fitnessprogramer.com/15-hardest-exercises/#google_vignette
https://www.boxrox.com/dragon-flag-benefits-how-to-muscles-progressions/#:~:text=Created%20by%20Martial%20Artist%20Bruce,the%20calisthenics%20and%20strength%20communities.
https://www.exercise.com/learn/top-10-hardest-exercises-ever/
https://en.wikipedia.org/wiki/Paul_Henry_Allen_Lynch#:~:text=On%2021%20April%201992%20at,finger%20in%20an%20electrical%20socket.%22
https://en.wikipedia.org/wiki/Human_flag#:~:text=The%20world%20record%20for%20longest,5%20seconds%20by%20Wang%20Zhonghua.
https://www.exercise.com/learn/top-10-hardest-exercises-ever/