SELECT T2.Height FROM body_builder AS T1 JOIN people AS T2 ON T1.People_ID  =  T2.People_ID WHERE T1.Total  <  315
What are the heights of body builders with total score smaller than 315?
[Schema (values) (types)]: | body_builder |  body_builder : body_builder_id (text) , people_id (number) , snatch (number) , clean_jerk (number) , total (number) | people : people_id (text) , name (number) , height (number) , weight (number) , birth_date (number) , birth_place (number);