I'll have to agree with the other reviews of this delightful cardio challenge and always bring the water.
Parking at the Central trailhead is easiest if you're there before 7am. It's interesting that there will be a line of cars waiting for a parking spot to open up when the 7th St. trailhead has ample parking.
The first of the 4 inclines is the most challenging, but it raises the heartrate & I can keep it elevated the rest of the climb that way.
The trail is frequently busy, and some hikers forget that up-hill has right of way, but the trail is wide enough that it usually isn't an issue.
For an added challege, after I reach the summit, I decide the other side to the first "landing," and then have another steep incline back up before it's downhill all the way.
This is my favorite easy workout in this area. Lookout mountain is also steep, but doesn't have the same challenge/distance.