Repetition phase detection

1. A system, comprising:

a processor configured to:

receive a stream of measurements of extension of a component of an exercise machine;

detect a first phase of a repeated motion, wherein the repeated motion includes a squat, a lunge, a bench press, a deadlift, a bicep curl, a tricep extension, or any combination thereof;

detect a transition to a second phase of the repeated motion, wherein a time constraint is applied to the detection of the transition to the second phase of the repeated motion, comprising to:

perform one of the following:

A) determine that a position has changed by at least a first threshold amount while in a rest phase, wherein the first threshold amount is a function of a range of motion of the repeated motion; and

in response to a determination that position has changed by at least the first threshold amount while in the rest phase, detect that the transition has occurred;

or

B) determine that a position has changed by at least a second threshold amount while in an isometric hold phase, wherein the second threshold is a function of a range of motion of the repeated motion; and

in response to a determination that the position has changed by at least the second threshold amount while in the isometric hold phase, detect that the transition has occurred; and

control a resistance associated with the second phase of the repeated motion; and

a memory coupled to the processor and configured to provide the processor with instructions.

2. The system of claim 1 , wherein the first phase comprises one of a concentric phase, the isometric hold phase, an eccentric phase, and the rest phase.

3. The system of claim 1 , wherein the repeated motion is associated with an exercise that begins at a top position.

4. The system of claim 1 , wherein the first phase comprises a concentric phase, wherein the second phase comprises the rest phase, and wherein the transition is detected at least in part by detecting a valid maximum.

5. The system of claim 1 , wherein the first phase comprises a the rest phase, wherein the second phase comprises an eccentric phase, and wherein the transition is detected at least in part by detecting that a position of the component of the exercise machine has decreased by at least a third threshold amount.

6. The system of claim 1 , wherein the first phase comprises an eccentric phase, wherein the second phase comprises the isometric hold phase, wherein the transition is detected at least in part by detecting a valid minimum.

7. The system of claim 1 , wherein the repeated motion is associated with an exercise that begins at a bottom position.

8. The system of claim 7 , wherein the first phase comprises an concentric phase, wherein the second phase comprises the isometric hold phase, and wherein the transition is detected at least in part by detecting a valid maximum.

9. The system of claim 7 , wherein the first phase comprises the isometric hold phase, wherein the second phase comprises an eccentric phase, and wherein the transition is detected at least in part by detecting that a position of the component of the exercise machine has decreased by at least a fourth threshold amount.

10. The system of claim 7 , wherein the first phase comprises an eccentric phase, the second phase comprises the rest phase, and wherein the transition is detected at least in part by detecting a valid minimum.

11. A method, comprising:

receiving a stream of measurements of extension of a component of an exercise machine;

detecting a first phase of a repeated motion, wherein the repeated motion includes a squat, a lunge, a bench press, a deadlift, a bicep curl, a tricep extension, or any combination thereof;

detecting a transition to a second phase of the repeated motion, wherein a time constraint is applied to the detection of the transition to the second phase of the repeated motion, comprising to:

performing one of the following:

A) determining that a position has changed by at least a first threshold amount while in a rest phase, wherein the first threshold amount is a function of a range of motion of the repeated motion; and

in response to a determination that position has changed by at least the first threshold amount while in the rest phase, detecting that the transition has occurred;

or

B) determining that a position has changed by at least a second threshold amount while in an isometric phase, wherein the second threshold amount is a function of a range of motion of the repeated motion; and

in response to a determination that the position has changed by at least the second threshold amount while in the isometric phase, detecting that the transition has occurred; and

controlling a resistance associated with the second phase of the repeated motion.

12. The method of claim 11 , wherein the first phase comprises one of a concentric phase, the isometric hold phase, an eccentric phase, and the rest phase.

13. The method of claim 11 , wherein the repeated motion is associated with an exercise that begins at a top position.

14. The method of claim 11 , wherein the first phase comprises a concentric phase, wherein the second phase comprises the rest phase, and wherein the transition is detected at least in part by detecting a valid maximum.

15. The method of claim 11 , wherein the first phase comprises the rest phase, wherein the second phase comprises an eccentric phase, and wherein the transition is detected at least in part by detecting that a position of the component of the exercise machine has decreased by at least a third threshold amount.

16. The method of claim 11 , wherein the first phase comprises an eccentric phase, the second phase comprises the isometric hold state, and wherein the transition is detected at least in part by detecting a valid minimum.

17. The method of claim 11 , wherein the repeated motion is associated with an exercise that begins at a bottom position.

18. The method of claim 17 , wherein the first phase comprises a concentric phase, wherein the second phase comprises the isometric hold phase, and wherein the transition is detected at least in part by detecting a valid maximum.

19. The method of claim 17 , wherein the first phase comprises the isometric hold phase, wherein the second phase comprises an eccentric phase, and wherein the transition is detected at least in part by detecting that a position of the component of the exercise machine has decreased by at least a fourth threshold amount.

20. The method of claim 17 , wherein the first phase comprises an eccentric phase, wherein the second phase comprises the rest phase, and wherein the transition is detected at least in part by detecting a valid minimum.

21. The system of claim 1 , wherein the detecting of the first phase of the repeated motion comprises to:

detect an extremum having an extremum parameter, wherein the extremum parameter includes a cable length detected extrema or a cable speed detected extrema; and

match the extremum parameter with a previously determined signature associated with the user, wherein the previously determined signature relates to a predetermined repetition pattern.