How to send text messages to remind gym members to come to exercise?

establish n groups according to the time period when members come to exercise.

Send text messages to remind members to come to the gym one day or half a day in advance.

in addition to the warm reminder of the fitness time, the mass short messages should also send some fitness-related information (such as fitness precautions, usual exercise, etc.) and important reminders of work and life (such as driving safety, new information on anti-fraud and anti-theft, etc.).

send a message to congratulate you on holidays.

members send separate messages to congratulate them on their birthdays.