Hello Guys !
First of im a 15 year old swimmer from sweden=) i cant really use my legs when i swim so i only swim whith my arms, i can stand up but i dont use them when i swim. i currently swim 6 times a week a total of 12 hours+ 2-3 workouts. i currently do the teen workout because it covers all the muscles i need for simming but my trainer says that i need endurance muscles. how could i do to get that? do more reps on each excersise? if so how many? thanks guys
You gain endurance in swimming by swimming more. :3
As for the teen workout, just maintain such.

As for your legs, do you mean you're unable to kick with it or you don't know how?