Research goal:
The research aims to "the effect of endurance training of various kinetic paths with taking a nutritional supplement on the level of the hormone erythropoietin and some physical variables for football juniors under 16 years old" by identifying8
1- Effect of endurance training of various kinetic pathways on the level of some physiological variables (erythropoietin - iron - ferritin) for football juniors under 16 years old.
2- The effect of endurance exercises of various kinetic paths on some physical variables (periodic respiratory endurance - speed endurance - force endurance - transitional speed- strength characterized by speed) for football juniors under 16 years old.
3- Identifying the percentages of improvement in the level of some physiological and physical variables under consideration for football youth under 16 years old.\د The researchers used the quasi-experimental approach by designing  one experimental group with two measurements, before and after.
Community and sample research
The research community was determined from football juniors under 16 years old in the Gharbia region, and the researchers selected a sample of (15) youths in an intentional way from soccer juniors under 16 years old at Samanoud Sports Club who are registered with the Egyptian Football Association and participants in the Gharbia region league season 2020-2021.