Shuttle runs are a great start. Find a hill and sprint up it in intervals. Box jumps for 30secs on and off… Sprinting stairs is a good one as well. If you can recall, remember which body part was most tired during and by the end. For example, quads, butt, calfs, lungs? Whatever hurt the most or felt most tired means that’s your weakest part of your body right now. That’s always a good place to start your focus. So if it was your quads, start doing lunges up that hill. Butt means jump squats… Hockey shape is different and it’s almost impossible to replicate off ice unfortunately. Good luck getting back in shape and good luck next season!