Considering 75 Hard and have a few questions

For quite some time, I've been a regular gym goer and I get out to do cardio a few days a week outside. Having said that, I really am feeling the desire to get more locked in and have something that gets me focused. The more I've looked around, 75 Hard seems to be the answer to that.

If you were someone who was already exercising or working out regularly prior to doing 75 Hard, what did you feel the difference was once you started into the program? What did it change for you in your routine after? I'd especially be interested in hearing from anyone who successfully did the program and now you are a ways out from it, like a year or more later.