Athletic band with removable module

1. A device configured to be worn by a user comprising:

a housing configured to be worn along an appendage of a user, the housing including:

a sensor, such that upon proper placement of the housing on the appendage of the user, the sensor is aligned at a first orientation that is directly on or over the appendage of the user;

a processor; and

a non-transitory computer-readable medium that comprises computer-executable instructions, that when executed by the processor perform at least:

receiving first sensor data from the sensor at a first time period in which the sensor is located at a first location of a plurality of locations

calculating, using the first sensor data, a first value of a physiological parameter for the user;

instructing the user to perform a specific activity configured to trigger a known tension within a specific muscle within the appendage at the first location;

receiving second sensor data from the sensor during the specific activity;

calculate, using the second sensor data, a second value of the physiological parameter for the user; and

comparing the first value for the physiological parameter to the second value for the physiological parameter,

wherein if the first value for the physiological parameter is within a threshold range of the second value for the physiological parameter, communicate a notification to the user that a calibration is complete and the device is positioned correctly on the appendage of the user, and

wherein if the first value for the physiological parameter is outside of a threshold range of the second value for the physiological parameter, instruct the user to reposition the device on the appendage to a second location within the plurality of locations.

2. The device of claim 1 , wherein the specific activity is configured to cause movement to trigger a known tension within a specific muscle of a forearm of the user.

3. The device of claim 1 , wherein the first sensor data is associated with a period of rest for the user.

4. The device of claim 1 , wherein when at the first location, the device is worn on a wrist of the user in a position having a first distance to an elbow of the user, and wherein the second location is located on the wrist at a second distance to the elbow, wherein the second distance is longer than the first distance.

5. The device of claim 1 , wherein the physiological parameter comprises a heart rate.

6. The device of claim 1 , wherein the sensor comprises an optical heart rate sensor.

7. The device of claim 1 , wherein the sensor comprises an accelerometer.

8. The device of claim 1 , wherein the comparing of the first value for the physiological parameter to the second value for the physiological parameter accounts for demographic information of the user.

9. The device of claim 8 , wherein the demographic information includes a user sex, weight, age, and height.

10. The device of claim 1 , wherein the calibration is automatically initialized when the user puts on the device.

11. The device of claim 1 , wherein the calibration is manually initialized.

12. A computer-implemented calibration method comprising:

receiving first sensor data from a sensor device located at a first location along a user's appendage, wherein the sensor device is positioned directly over or on a user's appendage without intervening materials located between the sensor device and the user's appendage;

calculating, using the first sensor data, a first value of a physiological parameter for a user;

receiving second sensor data from the sensor device during performance of a specific activity by the user that triggers a known tension range within a specific muscle within the appendage at the first location the specific activity;

calculating, using the second sensor data, a second value of the physiological parameter for the user; and

comparing the first value of the physiological parameter to the second value of the physiological parameter,

wherein if the first value for the physiological parameter is within a threshold range of the second value for the physiological parameter, communicating a notification to the user that a calibration is complete and the sensor device is positioned correctly on the appendage of the user, and

wherein if the first value for the physiological parameter is outside of a threshold range of the second value for the physiological parameter, instructing the user to reposition the sensor device to a second location on the appendage.

13. The method of claim 12 , wherein the specific activity is configured to cause movement to trigger a known tension within a specific muscle of a forearm of the user.

14. The method of claim 12 , wherein the first sensor data is associated with a period of rest for the user.

15. The method of claim 12 , wherein the physiological parameter comprises a heart rate.

16. The method of claim 12 , wherein the comparing of the first value for the physiological parameter to the second value for the physiological parameter accounts for demographic information of the user.

17. A non-transitory computer-readable medium comprising computer-executable instructions, that when executed by a processor are configured to cause the processor to:

initialize a sensor calibration process, comprising:

receiving first sensor data from a sensor device aligned at a first orientation that is directly on or over an appendage of a user at a first location;

calculating, using the first sensor data, a first value of a physiological parameter for a user;

receiving second sensor data from the sensor device during performance of a specific activity by the user triggering a known tension range within a specific muscle within the appendage at the first location;

calculating, using the second sensor data, a second value of the physiological parameter for the user; and

comparing the first value of the physiological parameter to the second value of the physiological parameter,

wherein if the first value of the physiological parameter is within a threshold range of the second value of the physiological parameter, communicating a notification to the user that a calibration is complete and the sensor device is positioned correctly on the appendage of the user, and

wherein if the first value of the physiological parameter is outside of a threshold range of the second value of the physiological parameter, instructing the user to reposition the sensor device such that it is at least one of: aligned at second orientation or at a second location on the appendage of the user.

18. The non-transitory computer-readable medium of claim 17 , wherein the specific activity is configured to cause movement to trigger a known tension within a specific muscle of a forearm of the user.

19. The non-transitory computer-readable medium of claim 17 , wherein the physiological parameter comprises a heart rate.

20. The non-transitory computer-readable medium of claim 17 , wherein the comparing of the first value for the physiological parameter to the second value for the physiological parameter accounts for demographic information of the user.