Device to measure a persons fitness regime

From my research there seemed to be four main options to accurately measure the exercise a person claims to undertake. 

1. Heart Rate Monitor

• Very easy accessible and cheap
• Can upload information to he internet
• Used by athletes to condition or improve performance
• Can be affected by stress
• Used for tactical training
• Used for motivation already connected to a watch giving immediate feedback to user
• If used near another heart rate monitor can give false reading  

The major bonus of heart rate monitors is the fact it can be uploaded to the internet already, but I don't think it would give an accurate reading for resemble a workout as stress effects it also.

2. Pedometer

• Counts number of steps a person takes
• It is worn throughout the day by a person
• Constant update of how steps you have taken
• Most basic pedometer is the spring-levered pedometer
• Piezo-electric pedometer (accelerometer) more accurate than spring-levered pedometers
• GPS pedometer

This device has numerous advantages can be uploaded to the internet, gives accurate reading but all it is doing is measuring steps undertook in a day which to athletes wouldn't be considered as a workout.

3. Telematics

This is a GPS system measuring distance is possible for cycling, running etc. It is a good system to measure distance and speed for a user but a user would have to undertake long hard exercise regimes to give the system useful feedback.

4. Skipping Counter

• Gives accurate amount of skips taken
• Calculates calorie lose
• Motivates a user by itself already
• 70-110 calories in 10mins
• 600-900 calories in 1 hour
• Cheap and easy accesible
• Upload to the internet unknown

This seems to be a suitable device as it measures accurately already is motivational and is not a daunting task for some one to attempt. I'm still not sure if it can be uploaded to the internet I have emailed a few producers of the product to see if it is possible.