(For easy install) 
(require to install EMF) https://www.gta5-mods.com/tools/car-weapon-folder-for-replacer

Drag and drop all the files to EMF/commonpeds.rpf

(Regular install)

Drag and drop 
  cs_tenniscoach.yed
to x64c/anim/expressions.rpf

Drag and drop 
 cs_fabien
 cs_tenniscoach
 cs_tenniscoach.yft
to x64g/levels/gta5/generic/cutspeds.rpf

Drag and drop 
 ig_fabien
 ig_tenniscoach
 ig_tenniscoach.yft
to x64e/models/cdimages/streamedpeds_ig.rpf

Drag and drop 
 char_tennis_coach.ytd
to update\update.rpf\x64\data\cdimages\scaleform_generic.rpf