Befor 3 years i have 145 kg weith and now am 80 kg i lose this weith in 2 mount and i can share my experience with you
Am math teacher and a trainer spisialiste for fat humain
Befor talk about motivation you must know somthing:
"Motivation is love and love is motivation"
For exemple: "i love sport so i have motivation to practice "
So it's simple to know if a person lose motivation
And it's also simple to motivate him you need just make him love this thing.
Am sorry about my bad english but i beleive that language it's not very importante the importante is the meaning