Lower body strenght

This series are an example of exercises that can be made with different available things(Weights Medicinal balls, ropes...)
These exercises are for the strnghtening of: Cuadriceps, Isquiotibiales, Gemeli, Gluteus...
1)Sit down; legs at 90º
2) Split or forward step; Leg forward 90º
3)Cuadriceps extension with oposition (weight, medicinal ball, companion...)
4) Isquios extension with charge(weight, ball, companion...)