Pass the Loop Band under your feet and grab it as showed, so that is slightly under tension in the upright position.
(Tension must obviously be equal to both sides).
Bend your knees against the band resistance with your lower limbs semi-flexed and the grip neutral (wrists looking at each other).
Attention: the exercise should not be confused with the Fist Curl.
Biceps brachii, Brachial, Brachioradialis.
10 per each set with a total of 3 sets.