The effect of a sand surface on physical performance responses of junior male handball players to plyometric training.

[ 1 ] found significant gains in 10-m performance with 8 weeks of plyometric training on either a firm floor or two highly unstable surfaces (∆ 1.5 and 1.9%, respectively; both p < 0.05); their study also showed a trend toward similar gains in 30-m performance (∆ 0.7 and 0.9%, respectively; p = 0.08) [ 7 ].

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