What are the names of the two students who are playing multiple sports?
SELECT T2.Fname , T2.Lname FROM Sportsinfo AS T1 JOIN Student AS T2 ON T1.StuID  =  T2.StuID GROUP BY T1.StuID having count ( * ) >1
names of the two students refers to Fname and Lname from Student table; playing multiple sports implies COUNT of sports per student > 1; joining tables Sportsinfo and Student on StuID indicates a relationship between student information and their sports activities;