people featured:
The lady doing the push-ups and yoga: @dressed_in_time (  / dressed_in_time  )
The lady pumping iron in a corset: @Abby Cox (   / @abbycox  
  / abbyelyn  )

The tight-lacers:
   • I Wear A Corset 20 Hours A day | HOOK...  
   • Mom of 3 with 18 Inch Waist Wears Cor...  
   • Man Loves His Wife's Tiny Waist | Str...  

further reading/watching:

entry level article: https://www.bustle.com/p/the-history-...
skeletal deformities: https://lucycorsetry.com/2015/10/05/c... (Lucy's site is an excellent source of reliable information on corsets)
https://www.forbes.com/sites/kristina...
MRI scans in a corset:    • MRI SCANS IN A CORSET: RESULTS | Lucy...  
growing up in a corset:    • I Grew Up in a Corset. Time to Bust S...  
wearing a corset for a week:    • I wore a corset for a week || (SPOILE...  
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My Instagram: https://bit.ly/2Qo9rrI
My nudes: https://bit.ly/2GZN1ur
My merch: https://bit.ly/2CCq5jE