If you walk down from the Assassin's Creed HQ in Masyaf, there are several small houses. When your around half way down the large hill, taking the path popular with the NPCs, there's a house with a haystack and down the slope, there's another haystack. One option here is to climb up 2 sets of ladders and jump on to a stack of 2 crates covered in colorful cloth and onto a higher roof with a wooden platform overlooking the haystack. Jumping off the house and into the haystack takes 10-20 seconds each time, but there's an even shorter way to perform a leap of faith. If you stick to the right on your way to the second haystack, you'll go up a slight slope which levels onto a platform considerably higher than the path below, which goes up to the haystack quite a few meters in front of you down the well tilted slope. Use
to quickly jog to the corner of the platform and then tap
to perform a leap of faith and soar like an eagle to your landing spot in the haystack. This is the quickest leap of faith setup in the game. Each run only takes 5-10 seconds.