All relevant articles from the aforementioned datasets were identified by two reviewers who conducted the data extraction independently (J.L.A.P. and S.M.P.). A third author (A.B.) resolved discrepancies. Reviewers were not masked to any pieces of information regarding the authors, the journal or the outcomes for each article reviewed. A standardized form was used to extract data concerning study design, number and mean age of participants, year and country of publication, setting, exercise program involved, follow-up timing, clinical outcome measures and reported findings. The form was developed according to the directions of the Cochrane Handbook for Systematic Reviews of Interventions—Version 5.1.0. This form was pilot-tested for reliability using a representative sample of the studies to be reviewed.