Here's an interesting website where you can download many free mocap's files
http://motcap.com/
How may you use these files?Step 1 - On Max 3Ds open or merge "bipedRig_Basic"
Step 2 - Click on PelvisNode
Step 3 - In the right menu click on "Motion"
Step 4 - If you need to upload .bip file then click on "Load File" on biped menu
Step 4 - If you need to upload a .bvh file then click on "Motion Capture" then on "Load Motion Capture File"
Good work and good luck!