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

Establish n groups according to the time period when members 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 fitness time, mass texting should also send some fitness-related information (such as fitness precautions, daily exercise, etc.). ) and important tips for work and life (such as driving safety, anti-fraud and anti-theft new information, etc.). ).

Send a message to congratulate the festival.

Send a separate message to congratulate the members on their birthdays.