I'm very optimistic about Soylent and just paid for a month, but saying exercise did not work for you is worrisome. Moving around heavy objects and maintaining a healthy diet (which Soylent may make easier to do) are the key to health, plain and simple.

What kind of exercise did you do, at what intensity, and for how long?

The creator of Soylent will be the first to tell you this (he works out quite a bit).