If you're a trainer, its
EASY!
Have all of your clients fill out your lifestyle questionnaire when they join your program, then schedule their free nutrition coaching call. Easy peasy, repeat, repeat, repeat.
If you have existing clientele, let them know you offer free coaching calls to help them break through plateaus and when they say "I'm in"... send them your application then schedule their call.
ONLINE HEALTH & FITNESS EXPERTS
Post generic health & fitness tips several times a week. Build reciprocity. Win fans. Build trust.
Examples:
The 4 best exercises to burn body fat if you're limited on time.
The truth about avocados and why you might limit them.
How 3 squeezes of lemon juice in your water cleanses the body.
On and on...
Follow other online health & fitness celebs and post variations of what they're posting.
Get collaboration & engagement from your followers:
Do you know what the best exercise is to burn body fat?
a) 20 min cardio b) deadlifts c) jumping jacks d) bicep curls
THEN once or twice a month post a before and after of one of your clients and shout them out on social media.
"Congrats to Rachel who dropped 3 dress sizes and 10 pounds with our program!!! That smile and those size 4 pants looks great on you!"
Then put:
"P.S. If you'd like to get results like my friend Rachel I offer Free 15 minute coaching calls to help you jump start your results!
Comment: "Interested" and i'll send you a short lifestyle survey, quickly fill it out, then i'll schedule a time to show you at least 3 things you can do right now to start getting better results"
Then you PM those who are interested with your website link. The best part is, you haven't annoyed any followers who may not be a fit or who's timing may not be right at the moment.