Start them young – Outline for youth resistance training: the 2014 International Consensus Position Statement
For guidelines on developing athletes over the long term the Youth Physical Development Model by Lloyd and Oliver is a good starting point.
Below are guidelines outlined for males and females.
Males
Females
Font size refers to importance
Light blue boxes for males and light pink boxes for females refer to preadolescent periods of adaptation
Dark blue boxes for males and dark pink boxes for females refer to adolescent periods of adaptation.
FMS = fundamental movement skills
MC = metabolic conditioning
PHV = peak height velocity
SSS = sport-specific skills
YPD = youth physical development.
Note, these are guidelines, and ideally programs should individualised according to the factors outlined above.
References:
Lloyd R, Oliver JL. The youth physical development model: A new approach to longterm athletic development. Strength & Condit J 2012;34(3):61-72.
Lloyd RS,Faigenbaum AD, Stone MH, et al. Br J Sports Med. Published Online First: September 20, 2013 doi:10.1136bjsports-2013-092952
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