Joey, thanks a lot for your reply, I get your point and that's pretty much what I want to do.
Maybe the thing is not "combine" programs but "adapt". It's impossible to combine 5/3/1 and Freeletics, because as I said, Freeletics is very random. But I read in the book that one possible thing is to adapt 5/3/1 with some Crossfit, so I thought that it could be pretty much a similar thing. As I'm new to 5/3/1, I'm not sure
What's what I'm looking for? Some kind of assistance that allows me to work power and explosiveness. I read about sprint in hills and other stuff, but I can't do that (I don't have hills around and I have to workout at home). So I was looking for some kind of HIIT (wich is something that I love to do).
For example, going into specifics. One of the Freeletics workouts is called "Aphrodite" and is this: 50 burpess, 50 squats, 50 sit-ups, then 40 of each, then 30 of each, then 20 and then 10 (in the end, 150 of each). Other one, "Dione", 75 jumping jacks-25 burpees - 50 straight lever - 75 jumping jacks - 50 situps - 25 burpees. Three times. Other, Venus, 50 pushups, 20situps, 50squats, three times. And there are many more. Would be crazy or a nonsense to do some of this workouts as assistance?
What I'm aiming for? I love to sprint, HIIT or whatsoever, this kind of dynamic-explosive stuff, and somehow I'd like to keep doing it, and don't know wich template is best for me, so that's why I thought about using freeletics workouts adapting them to the 5/3/1 program, wich has to be the core of everything.
Thanks again! (and sorry for my English, I'm from Madrid and I'm not used to write in English a lot)