Many youth players in our area seem to enjoy playing in winter 7v7 leagues at the indoor soccer complex. Lots of club and rec. players alike. Has anyone really noticed any developmental improvements from your spring/fall outdoor players who opted to play in winter indoor leagues (lets exclude futsol from discussion for now as most already agree its best option for footskill/speed training) vs. those that did not partake in winter soccer play of any sort? If so, what improvements did you notice?