oooh, active wear. Get your self some powerdry, the shelbykaava base layer pattern, a couple of hours and you will find the magic of a serger....

sergers are fabulous for knits, lycras, fleece, base layesr, edge finishing....

total capabilites will depend on what combination of seams your sergers does (2/3/4/5, coverstitch) So get the Singer book on sergers and active wear, that will tell you everything you need to know.