There's a theme that connects most of the Castaic Lake trails: many fire roads and doubletrack climbs. This one falls right into that category. Pro's Uphill has been used in many of the races around the lake. Use this trail to connect Cutler Canyon Fire Road to Grapevine.
Don't expect anything technical but it does get steep, in some spots over 30%, so bring strong legs and lungs and be ready to work.