During the entire season you trained hard, eaten healthy food, woke up early, faced the bad weather and after all that effort, THIS IS THE WAY YOU WILL PACE YOUR MARATHON??
Workout Genius advanced virtual partner feature allows you to plan and track second by second your marathon pacing with a lot of flexibility.
You can split your marathon into blocks and vary the pace along the race, you can slow down the virtual partner in that hill in the middle of your training/race course, you can also configure it to go along with you in a classic tempo run workout slowing down in the warm up, accelerating in the intensity section and slowing down in the cool down).
For a detailed description of this feature take a look at Genius Wrist website.