Free cycling Ramp/Step Test.

The Ramp Test will ramp up the power in 20-watt increments every minute until you simply cannot keep going. This test is designed to quickly identify the upper limit of your aerobic capacity and estimate your FTP (functional threshold power). The ramp portion will ideally take 5–20 minutes to complete. It should easy at first, but then get very hard very fast. Stay seated, keep a steady cadence, and keep ramping up until you simply cannot continue.