The proper air pressure will allow for the appropriate amount of sag. Sag is the amount the suspension compresses when supporting the rider, riding gear, and a portion of the bicycle. It is measured as a percentage, with the ideal percentage range being between 10-30% of the total available travel (less for shorter travel, more for longer travel). Setting up the suspension to achieve this will allow for maximum traction and an ideal suspension feel.
The proper Rebound speed is one that allows the suspension to return to sag quickly enough to be ready for the next trail feature, but not so quickly that the suspension causes the bike and rider to bounce and lose traction.
Record your Rebound speed by counting the number of clicks or turns from the slowest setting.
Lock (L) mode prevents the suspension from compressing. Use Lock mode for maximum pedaling efficiency on smoother terrain.