Fig. 4From: The impact of a school backpack's weight, which is carried on the back of a 7-year-old students of both sexes, on the features of body posture in the frontal planeThe frequency of significant associations of body posture features in the frontal plane with physical fitness features among 7-year-old boys and girls n = 65. The legend WY: endurance, SZ: speed, SI: strength, MO: power, ZW: agility. Altogether—the percentage of physical fitness features of significant associations with body posture features. M—boys, K—girlsBack to article page