The best way to prepare for trail hills is to train on the treadmill.
I had tried many years before to eat a plant-based only diet because I am lactose intolerant and as a cancer survivor who was afraid of what I was putting into my body but failed miserably because I did not go in prepared.
When training with the bags, it’s ideal to only do as many reps you can do clean. When you feel like you’re losing control, this is when you can injury yourself. Always remember proper form over number of reps to stay safe.