1. Have great overall strength
Lots of advice to do your strength training prior to your run to get the best effect.
For most runners, the effect on your run after a hard lift can be an emotional barrier to strength training. It was for me.
So, I've become convinced that there is an argument for doing your strength workout after your run.
Working to fatigue is a key to getting stronger and I recommend setting a 6RM to 10RM resistance.
6RM is the Mass that makes 6 Repetitions the most you can do. Similar for the 10RM, which would be a smaller mass, because you wouldn't reach fatigue until 10 reps.
Note: Fatigue is when you no longer have the ability to do the exercise correctly. Hard on the ego to do it correctly, better for long term success.
1. Main lift. Leg press, deadlift, or back squat for 3 sets to fatigue at 6RM. That may be 6 reps, 6 reps, 4 reps. It might be 7 reps, 6, 3. Don't stop at 6 reps just because you set the resistance at 6RM and don't despair that you may not get to 6 on each set.
2. Injury prevention lift. Eccentric calf raises with heels hanging over the edge of a step or something similar. Raise up on your toes, pause at the top, then slowly lower yourself on one foot. Back up using both feet, the slowly lower single legged again. Repeat to fatigue, then switch sides. 3 sets
3. First supportive exercise. Band resisted sidestep walk (I call them monsters). Keep your feet parallel to each other and pointing straight ahead. 3 sets to fatigue.
4. Second supportive exercise. Copenhagen plank to fatigue. Once on each side. Lots of variants.
Do more exercises if you like, and remember to work to fatigue, no matter what the resistance. Twice a week.
Happy Running!