Marvin Harrison Jr. was unstoppable on Day 4 of Arizona Cardinals training camp. The Cards second year player made several trips to the endzone during the practice. Plus, Will Johnson and Darius Robinson look ready to compete! #marvinharrisonjr #kylermurray #azcardinals #trainingcamp #willjohnson #dariusrobinson SUBSCRIBE: youtube.com/channel/UCKaPEqS_Mc6eGNNBQN1QgQw Website: gophnx.com PHNX Locker: PHNXLocker.com Social Twitter: @PHNX_Sports Instagram: @PHNX_Sports