When I first moved to Surat Thani I was unsure how active I would be. I am used to playing a lot of sports and being very active. However, when I arrived I found there are many ways that you can be active in Surat. There are many gyms to choose from and there is an island dedicated to outdoor workout machines . Also, there is a stadium with a variety of fields and activities.
My own experience of being active in Surat started from joining a gym. There are a variety of gyms to choose to from, but the best one I found was Premier Fitness. They offer different deals based on how many months you pre-purchase.
I also played for a football team here in Surat. It is ran by some other expats and every couple of months we competed in tournaments against other teams all over Southern Thailand. Throughout the year we played in Krabi, Koh Phangan and Nakhon Si Thammarat. Playing for the Surat Penguins was a great way to stay active while seeing new parts of Thailand.
There are many other different sports that people participate in. I know people who play touch rugby, tennis, golf and Thai Boxing. These are mainly organized on Facebook through the Surat Thani Teachers. This is also a good place to ask any questions that you may have.