calculating the number of days

hi

i have a spreadsheet of run and cycle data. I am trying to set up a formula that will calculate:

* the run or cycle number (starting at 1)
* the number of days since a previous run, or previous cycle,
* the total weekly miles for cycling and running

I've attached an example spreadsheet, which shows some basic run/cycle data on the left hand side, and on the right are blank spaces that I want calculated. Can anyone assist with the formulas I should be using?


I am using excel 2003.

Cheers

Dean