I already use two SARIS Climbing (adjustable levels) Blocks with my SARIS trainer. I wanted something a bit more challenging/sweat producing and got a 3rd climbing block. It WORKS, by adjusting the levels, you can produce a REALLY STEEP climb. I usually go 30 minutes with the double and 20 minutes with the triple, and 10 mi cool down with the double.
It does an ok job of holding the front tire in position while on the trainer. It can shift when really stomping on a climb, but is relatively easy to shift back while riding. Some folks might just use a stack of phone books, but these are obsolete and hard to find these days.
