System, method and apparatus for exercise device

1. An exercise device, comprising:

a handle having a handle axis and a handle weight;

a head removably coupled to a distal end of the handle with a single fastener adjacent a proximal end of the head, the head comprises a head weight, the head is axe-shaped, a distal end of the head is blunt, a portion of each of the proximal and distal ends of the head is planar, the head comprises a metallic core that is overmolded with a polymer, wherein the head weight is distributed asymmetrically with respect to a geometric center of the head in at least one of x, y and z-axes of the head; and

a total weight of the exercise device is at least about 2 pounds.

2. The exercise device of claim 1 , wherein the handle weight is not greater than about 30% of the head weight, and further comprising a wrist strap extending from the handle and configured to be connected to a wrist of the user to restrain the exercise device during chopping motions by the user.

3. The exercise device of claim 1 , wherein the handle comprises no non-fastener metallic components.

4. The exercise device of claim 1 , wherein substantial entireties of the proximal and distal ends of the head are substantially parallel to each other.

5. The exercise device of claim 1 , wherein the head comprises side walls on opposing lateral sides thereof, and the sidewalls are substantially parallel to each other.

6. The exercise device of claim 1 , wherein the head comprises a center of mass that is spaced apart from the handle axis by at least about 4 cm.

7. The exercise device of claim 1 , wherein at least about 25% of the head weight or total weight of the exercise device is located within about 2.5 cm of the handle axis, and not greater than about 60% of the head weight or total weight is located within about 2.5 cm of the handle axis.

8. The exercise device of claim 1 , wherein at least about 50% of the head weight is located within about 6 cm of the handle axis, and not greater than about 80% of the head weight is located within about 6 cm of the handle axis.

9. The exercise device of claim 1 , wherein at least about 20% of the head weight is located within about 2.5 cm of the distal end of the head, and not greater than about 50% of the head weight is located within about 2.5 cm of the distal end of the head.

10. The exercise device of claim 1 , further comprising concave recesses formed in lateral sides of the head, each concave recess is asymmetric in at least one dimension, the head comprises a head width, each concave recess extends into the head in a range of at least about 10% of the head width to not greater than about 40% of the head width.

11. The exercise device of claim 1 , wherein:

the handle comprises a handle distal portion adjacent the head, a handle proximal portion opposite the handle distal portion, and a handle middle portion located between the handle proximal and distal portions, each of which is configured to be gripped by a user;

the handle proximal portion comprises a loop configured to be secured to a hand strap of the user to restrain the exercise device during chopping motions by the user; and

one of the handle and the head comprises a spline, and the other of the handle and the head comprises a groove configured to couple with the spline.

12. The exercise device of claim 11 , wherein:

when the handle distal portion is gripped in a hand of the user and the handle is vertical, a total magnitude of force applied to the hand by the exercise device is at least about 30% greater than the actual head weight, and not greater than about 60% of the actual head weight; and

when the handle distal portion is gripped in the hand of the user and the handle is horizontal, a total magnitude of force applied to the hand by the exercise device is at least about 400% greater than the actual head weight, and not greater than about 600% of the actual head weight.

13. The exercise device of claim 11 , wherein:

when the handle middle portion is gripped in a hand of the user and the handle is vertical, a total magnitude of force applied to the hand by the exercise device is at least about 30% greater than the actual head weight, and not greater than about 60% of the actual head weight; and

when the handle middle portion is gripped in the hand of the user and the handle is horizontal, a total magnitude of force applied to the hand by the exercise device is at least about 200% greater than the actual head weight, and not greater than about 300% of the actual head weight.

14. The exercise device of claim 11 , wherein:

when the handle proximal portion is gripped in a hand of the user and the handle is vertical, a total magnitude of force applied to the at least one hand by the exercise device is at least about 30% greater than the actual head weight, and not greater than about 60% of the actual head weight; and

when the handle proximal portion is gripped in the hand of the user and the handle is horizontal, a total magnitude of force applied to the hand by the exercise device is at least about 100% greater than the actual head weight, and not greater than about 200% of the actual head weight.

15. An exercise device, comprising:

a handle having a handle axis;

a head coupled to the handle, the head comprises a head weight that is distributed asymmetrically with respect to a geometric center of the head in at least one of x, y and z-axes of the head;

substantial entireties of the proximal and distal ends of the head are substantially parallel to each other;

side walls of the head are on opposing lateral sides of the head, and the sidewalls are substantially parallel to each other, wherein the head is axe-shaped and the distal end of the head is blunt;

the head comprises a metallic core that is overmolded with a polymer; and

a total weight of the exercise device is at least about 2 pounds.

16. The exercise device of claim 15 , wherein:

the head comprises a center of mass that is spaced apart from the handle axis by at least about 4 cm; and

at least about 25% of the head weight is located within about 2.5 cm of the handle axis, and not greater than about 60% of the head weight is located within about 2.5 cm of the handle axis.

17. An exercise device, comprising:

a handle having a handle axis, a handle proximal portion, a handle middle portion and a handle distal portion;

a head coupled to the handle, and the head comprises a head weight, wherein the head is axe-shaped and a distal end of the head is blunt, wherein the head comprises a core that is over-molded with a polymer has been inserted after; wherein

when the handle distal portion is gripped in a hand of the user and the handle is vertical, a total magnitude of force applied to the hand by the exercise device is at least about 10% greater than the head weight, and not greater than about 100% of the head weight;

when the handle middle portion is gripped in the hand of the user and the handle is vertical, a total magnitude of force applied to the hand by the exercise device is at least about 25% greater than the head weight, and not greater than about 150% of the head weight; and

when the handle proximal portion is gripped in the hand of the user and the handle is vertical, a total magnitude of force applied to the hand by the exercise device is at least about 50% greater than the head weight, and not greater than about 200% of the head weight; and

a wrist strap extending from the handle and configured to be connected to a wrist of the user to restrain the exercise device during chopping motions by the user.