Learn more about recent data loss and site problems
here.
The Fitness Log export should be working again.
Fitness Log

The Fitness Log is the heart of PhysicsDiet.com. To use the tools on PhysicsDiet.com
you need to weigh yourself every day and then enter your weight in the Fitness Log.
If you have a Body Fat Analyzer you can also enter your Body Fat %. If you want
to track your cardiovascular fitness, you can enter your Resting Heart rate too.
PhysicsDiet.com uses the information in your Fitness Log to calculate your Average
Weight, your Body Mass Index (BMI), Resting Metabolic Rate (RMR), and Adjusted Metabolic
Rate (AMR).
PhysicsDiet.com also uses the information in your Fitness Log to create your Progress
Charts.
Your Average Weight is calculated as an exponentially smoothed moving average of
all the weights in your Fitness Log. Your Average Weight shows up in your weight
chart as the blue line.
Your Body Mass Index is calculated each day using the weight you entered for that
day and the height in your PhysicsDiet.com Profile. If your BMI is 0, make sure
your Profile is complete.
Your Resting Metabolic Rate is calculated each day using the gender and date of
birth in your Profile. If your RMR is 0 make sure your Profile is complete.
Your Total Energy Expenditure is calculated each day based on your RMR and the Activity
Level in your Profile. If your TEE is 0 make sure your Profile is complete.