A sensitive period is a broad timeframe or window of opportunity when the learning of a specific skill or the development of a specific physical capactiy is particularly effective. The entire period of childhood can be viewed as a sensitive period for mastering fundamental movement skills.
Trainability during the sensitive periods of accelerated adaptation to training refers to the body's responsiveness to training stimuli at different stages of growth and maturation. The physiological systems of the athlete can be trained at any age, but there are sensitive periods when individuals are especially responsive to specific types of training.
The ten S's have been identified as important to building a complete and holistic plan for developing athletes: Stamina (Endurance) - Strength - Speed - Skill - Suppleness (Flexibility) - Structure/Stature Schooling - (p)Psychology - Sustenance - Socio-Cultural