HI, Jennifer,
Actually, the tower is used in the very first week of Meso #1 for chin ups/pull ups. An option is given using a band if you do not have the tower and I saw a post that said she was using her squat rack in place of the tower, so I'm sure you could get creative if you really need to put off purchasing at this time. I am currently working on Meso #3 and the tower is not even used, so if you do decide to purchase the tower, the earlier in the program that you get it, the better.