Training device with collapsible arms

A training device comprising:

• a hub comprising an upper side, a lower side, and a plurality of ports;
• a plurality of elastic cords extending from the hub and accessible via at least one of the plurality of ports;
• and
• a plurality of arms extending from the hub, wherein each of the plurality of arms (i) has a proximal end proximate the hub and a distal end distal the hub, (ii) extends along an axis from the hub, (iii) is coupled to one of the plurality of elastic cords, and (iv) is configured to move relative to the hub,
• wherein the training device is configured to assume (i) a closed state wherein the plurality of arms extends downwardly from the lower side of the hub and (ii) an open state wherein the plurality of arms extends laterally outwardly from the hub between the upper side and the lower side of the hub and in different directions from the hub,
• wherein the plurality of elastic cords bias the plurality of arms in the open state,
• wherein the plurality of arms comprises a first arm, a second arm, a third arm, and a fourth arm,
• wherein, in the open state, the axis of the first arm and the axis of the third arm are substantially colinear and the axis of the second arm and the axis of the fourth arm are substantially colinear,
• wherein, in the closed state, the first arm, the second arm, the third arm, and the fourth arm extend from the hub such that the axis of each of the first arm, the second arm, the third arm, and the fourth arm are substantially parallel but not substantially colinear, and
• wherein the plurality of elastic cords comprises a first elastic cord and a second elastic cord, wherein the first elastic cord is coupled to the first arm and the third arm, and the second elastic cord is coupled to the second arm and the fourth arm.