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The ME workouts will be beneficial even if you have a strength deficiency. But, you will get better results from the ME work if you first develop strength. You can do this in a gym with weighted box step ups, Bulgarian split squat, Lunges…these types of single legged exercises. Hill sprints are a good way to develop specific uphill running power but you need a quite steep hill for these to be most effective.
For mountain running we like to use the ME workout described in this article https://uphillathlete.com/strength-training-for-the-mountain-athlete/ In the section titled
Specific Workout for Runners and Skiers
This is done in a gym. It has proven itself very effective for mountain runners and forms the basis of this plan https://uphillathlete.com/mike-foote-big-vert-ultra-run-training-plan/
You can do hill sprints at the same time as the ME work if your legs can handle it and recover. During the ME period you may find that your running times do not improve at all. But after you stop the ME you should see improving performance for many weeks, especially if you begin to integrate high intensity intervals.