Children and adolescents in a summer tennis instruction program were t
aught a ''metaphor method'' for eliminating distractions and detriment
al ideation. They visualized themselves enclosed in a bubble, cocoon,
or chrysalis that separated them from nontask stimuli. Although subjec
ts in the experimental and control groups were positive in their evalu
ations of their tennis experience, ratings from instructors demonstrat
ed multiple advantages of the metaphor method. When compared to contro
l group subjects receiving regular instruction, students taught to use
boundary metaphors improved significantly in terms of performance cri
teria and ability to concentrate. Their instructors also rated them si
gnificantly higher in enjoyment of the experience, motivation, and a d
isplay of mature and appropriate behavior. The method was easy to impl
ement and appears adaptable to a variety of sports and other performan
ce settings.