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ޭL((((((((((( ]V:mտ"O2;~+.@ *m?8V\Jɍ^Ac;jK_=we]jZ)PjvQt)\#AW Y: -*fe( |g$`nŢ)QE QE QE QE QE QE QE QE QE QE yVM3\([ ( ( ( ( n e o f t h e b e s t m o t i v a t o r s . I t k e e p s t h e m c o m i n g b a c k b e c a u s e t h e y c a n s e e a b s o l u t e p r o g r e s s . < b r > < b r > C o m b i n e t h i s p h y s i c a l t r a i n i n g w i t h m a s s i v e a m o u n t s o f m e n t a l P s y c h o l o g y o f S u c c e s s t r a i n i n g a n d y o u a r e o n y o u r w a y t o c r e a t i n g a f o r c e o f g r e a t c o m p e t i t i v e p o w e r . D e l H e s s e l s a i d , T h e s p i r i t o f a m a n i s a s u p e r n a t u r a l f o r c e t h a t e n a b l e s h i m t o a c h i e v e w h a t e v e r h e t r u l y d e s i r e s . B e l i e v e m e , i t d o e s n t h u r t t o h a v e s u p e r n a t u r a l f o r c e s o n y o u r s i d e . U s e t h o s e m o t i v a t i o n a l q u o t e s a n d s a y i n g s ; t h e y h a v e t h e p o w e r t o c h a n g e l i v e s , a n d t e a m s , a n d c o a c h i n g s t a f f s . f f , P h . D . , a n e x e r c i s e s c i e n t i s t w h o s e d o c t o r a t e t h e s i s e x a m i n e d t h e b i o m e c h a n i c s o f s o f t t i s s u e s . < b r > I t h a s n e v e r b e e n s h o w n s c i e n t i f i c a l l y o r c l i n i c a l l y t h a t t h e p e r i o d i c i m p o s i t i o n o f l a r g e f o r c e s b y w e i g h t t r a i n i n g o n t h e g r o w i n g b o d y c a u s e s d a m a g e t o t h e e p i p h y s i a l p l a t e s , s a y s S i f f , i n h i s b o o k F a c t s a n d F a l l a c i e s o f F i t n e s s . I t i s e x t r e m e l y m i s l e a d i n g t o f o c u s o n t h e a l l e g e d r i s k s o f w e i g h t t r a i n i n g o n c h i l d r e n w h e n b i o m e c h a n i c a l r e s e a r c h s h o w s t h a t s i m p l e d a i l y a c t i v i t i e s s u c h a s r u n n i n g , j u m p i n g , s t r i k i n g o r c a t c h i n g c a n i m p o s e f a r g r e a t e r f o r c e s o n t h e m u s c u l o s k e l e t a l s y s t e m t h a n v e r y h e a v y w e i g h t t r a i n i n g . < b r > T o i l l u s t r a t e h i s p o i n t , S i f f c o m p a r e d t h e s t r e s s o f s q u a t t i n g w i t h r u n n i n g . S u p p o s e t h a t o n e c h i l d r u n s a f e w h u n d r e d m e t e r s a d a y i n s o m e s p o r t i n g o r r e c r e a t i o n a l a c t i v i t i e s . T h i s c a n e a s i l y i n v o l v e s e v e r a l t h o u s a n d f o o t s t r i k e s i n w h i c h t h e r e a c t i o n f o r c e i m p o s e d o n t h e b o d y c a n e a s i l y e x c e e d 4 t i m e s b o d y w e i g h t w i t h e v e r y s t r i d e . N o w l e t a n o t h e r c h i l d d o a t y p i c a l a v e r a g e w e i g h t t r a i n i n g s e s s i o n w i t h 3 - 5 s e t s o f s q u a t s ( s a y , w i t h 1 0 r e p s , 8 , 6 a n d 4 r e p s ) , w i t h b o d y w e i g h t o r m o r e f o r t h e l a s t s e t . T h a t b o d y w e i g h t i s d i v i d e d b e t w e e n t h e t w o l e g s , s o t h a t , e v e n t a k i n g a c c e l e r a t i o n i n t o a c c o u n t , t h e l o a d i n g p e r l e g i s b o d y w e i g h t o r a l i t t l e m o r e , w h i l e t h e s p i n e i s s u b j e c t e d t o t h e f u l l l o a d o n t h e b a r . I n o t h e r w o r d s , t h e l e g s a n d s p i n e i n c o n t r o l l e d s q u a t t i n g a r e e x p o s e d t o s i g n i f i c a n t l y l e s s f o r c e t h a n i n r u n n i n g a n d j u m p i n g . N o r m a l l y , e x e r c i s e s s u c h a s s q u a t t i n g w i l l b e d o n e n o m o r e t h a n t w i c e a w e e k f o r a t o t a l o f a b o u t 6 0 r e p e t i t i o n s , w h i l e t h e r u n n i n g c h i l d w i l l r u n e v e r y d a y a n d s u b j e c t t h e b o d y t o t h o s e m a n y t h o u s a n d s o f i m p u l s i v e f o o t s t r i k e s . < b r > I t d o e s n o t r e q u i r e m u c h s c i e n t i f i c k n o w l e d g e o r c o m p u t a t i o n a l g e n i u s t o s e e t h a t t h e c u m u l a t i v e l o a d i n g i m p o s e d b y s i m p l e r u n n i n g a c t i v i t i e s o n t h e l o w e r e x t r e m i t i e s a n d t h e s p i n e i s f a r g r e a t e r t h a n t h e c u m u l a t i v e l o a d o f t w o o r t h r e e t i m e s a w e e k o f w e i g h t t r a i n i n g . D o e s t h i s n o w m e a n t h a t w e a r e j u s t i f i e d i n r e c o m m e n d i n g t h a t c h i l d r e n n o t b e a l l o w e d t o r u n , j u m p , t h r o w o r c a t c h b e c a u s e b i o m e c h a n i c a l r e s e a r c h d e f i n i t e l y s h o w s t h a t s u c h a c t i v i t i e s c a n p r o d u c e v e r y l a r g e f o r c e s o n m a n y p a r t s o f t h e g r o w i n g b o d y ? < b r > I t s h o u l d b e o b v i o u s t h e n t h a t t h e r e i s n o t h i n g w r o n g w i t h r u n n i n g a n d o t h e r n o r m a l a c t i v i t i e s o f c h i l d h o o d , a n d t h e r e f o r e n o r e a s o n t o d i s a l l o w a c t i v i t i e s o f l e s s e r i m p a c t , s u c h a s c a r e f u l l y s t r u c t u r e d p r o g r a m