First repetition detection

1. A system, comprising:

a processor configured to:

receive a stream of measurements of extension of a component of an exercise machine, wherein the stream of measurements comprises measurements of cable position of a cable of the exercise machine;

characterize the stream of measurements including detecting at least one extremum having at least one extremum parameter;

match the extremum parameter with a previously determined signature associated with a user, wherein the previously determined signature comprises an acceptable range of maximum cable positions and an acceptable range of minimum cable positions;

based at least in part on the matching, detect an occurrence of a first repetition; and

change an output of the exercise machine based at least in part on detecting the occurrence of the first repetition; and

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

2. The system of claim 1 , wherein the acceptable range of maximum cable positions is defined based at least in part on a personalized maximum and an amount of acceptable variation.

3. The system of claim 2 , wherein the personalized maximum is based at least in part on historical data associated with the user.

4. The system of claim 2 , wherein the amount of acceptable variation is based at least in part on historical information across a plurality of users.

5. The system of claim 1 , wherein detecting the at least one extremum comprises determining a sequence of the at least one extremum.

6. The system of claim 1 , wherein the extremum parameter is associated with a timing of the at least one extremum.

7. The system of claim 1 , wherein the characterizing includes filtering the stream of measurements of extension of the component of the exercise machine.

8. The system of claim 1 , wherein changing the output comprises providing an indication of incrementing of a repetition counter.

9. A method, comprising:

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

wherein the stream of measurements comprises measurements of cable position;

characterizing the stream of measurements including detecting at least one extremum having at least one extremum parameter;

matching the extremum parameter with a previously determined signature associated with a user, wherein the previously determined signature comprises an acceptable range of maximum cable positions and an acceptable range of minimum cable positions;

based at least in part on the matching, detecting an occurrence of a first repetition; and

changing an output of the exercise machine based at least in part on detecting the occurrence of the first repetition.

10. The method of claim 9 , wherein the acceptable range of maximum cable positions is defined based at least in part on a personalized maximum and an amount of acceptable variation.

11. The method of claim 10 , wherein the personalized maximum is based at least in part on historical data associated with the user.

12. The method of claim 10 , wherein the amount of acceptable variation is based at least in part on historical information across a plurality of users.

13. The method of claim 9 , wherein detecting the at least one extremum comprises determining a sequence of the at least one extremum.

14. The method of claim 9 , wherein the extremum parameter is associated with a timing of the at least one extremum.

15. The method of claim 9 , wherein the characterizing includes filtering the stream of measurements of extension of the component of the exercise machine.

16. The method of claim 9 , wherein changing the output comprises providing an indication of incrementing of a repetition counter.