its fairly obvious how you increase strides, its like ANYTHING in parkour. you have to start slow and small until its comfortable and then push it a tiny bit. one day of practice isnt going to net you an 8 foot stride thats comfortable.
unless of course you are already at a pretty decent level, in which case you shouldnt need an explanation other than trial and error.
you really need to move slower and concentrate on landing and leaving your feet calmly, in a controlled manner. you dont need to just plant a foot and skip across stuff, its really rather controlled. i go to an open gymnastics gym and doing them across balance beams helped me realize how much slower you need to go. IMHO you need to stand almost straight up to properly stride, it should all be in the legs. its not like running where you lean forward to move, quite the opposite.
when you plant a foot, you need to almost sink into that. it feels like you wait too long to launch into the next stride but, thats just how the mechanics of a stride works. sinking into each step gives you a solid base to jump from.
the stride is a rather advanced move, its much more complicated than a precision jump and takes a lot more bodily control than most jumps. if you have a hard time properly rebounding out of a jump into a roll, i wouldnt really worry about learning to stride just yet.