3 links
Mikes Flexible People
members.aol.com
Various pics and vids on all forms of flexibility and contortion including yoga, exercise, dance, gymnastics, contortion and acrobatics.
Rhythmflex Gymnastics
rhythmflex.org
Private gym in Rockville, Maryland, USA. Headed by Kate Jeffress.
Tricks Tutorials
trickstutorials.com
Provides forum, tutorials, pictures and video clips for performing acrobatic, martial art and gymnastic style tricks.