Consult the FAQ

Am I allowed to go to the gym/play sports after my embryo transfer?

There are no known data on the impact of normal sports practice on the success rate after a transfer. Therefore, if you practice a sport, you can continue to do so in moderation.
Sufficient exercise is important for good health, even after your transfer and during pregnancy. If you exercised regularly before your transfer, you may continue to do so. If you did not exercise before your treatment, it is best to start a moderate fitness program, but only in the second trimester of your pregnancy.