Each month has its own tab and all you have to do is input your distance, time, and any notes you want to write about your workout. Under the Running section to track your shoe mileage just type in the number corresponding with your shoe number under the running shoe tab. The spreadsheet will automatically track your mileage for each of your shoes.
The training log that I use includes training zones for each discipline; from Anaerobic Threshold, Heart Rate Reserve, and running pace zones to Functional Threshold Power, Power Profile and Race Zones on the bike. This additional data requires additional testing and a bit more complex for a simple training log.
You can download a sample 2015 Triathlon Training Log or purchase the complete log at the store. If you are an athlete of Tri-More-Fitness and would like to use this training log message me and I will send it to you at no cost.