Are there differences between regular and workout thongs?

imthtgirl
I am new to thongs and I have a lace thong and a workout spandex thong. Both my thongs are medium but the workout thong is tighter and goes up my butt a lot easier. Is that normal? Or should I buy a bigger thong to workout in? Should it fit like a regular lace thong? Girls please help!!
Are there differences between regular and workout thongs?
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