If you haven't done any sports-specific resistance training as of yet, you'll need to do Anatomical Adaptation (AA) first. This will mean light weights (10-20 reps) as you learn to do the exercises you'll train more intensely at down to track. During an AA phase (which should last at least 6 weeks), you generally do many exercises each session for only a couple sets each, with a fast but stable concentric action. You may start out with slow movements to make sure you get the correct muscle activation and technique, but once you've got your technique, you should aim to have a 1sec concentric. You should also gradually shorten the eccentric contraction to 2 sec. This phase uses a lot of core/stability work as well as your primary lifts.
A suitable AA program might look something like this:
Sessions/Week: 3
Sets/Exercise: 2
Reps: 15
Rest: 1 min
Tempo: (week 1-2: 4:0:2) (week 3-4: 3:0:1) (week 5+: 2:0:1)
- Bulgarian Split Squat (superset each side)
- Fitball Chest Press
- One-legged Deadlift (superset each side)
- Arnold Press standing on Bosu
- Full Squat on Bosu
- One-arm DB Row (superset each side)
- Incline Bench Press superset with Bench Pull
- Deadlift
- Chin Ups
- Balance on Fitball
- Medicine Ball Twist
Once you've done at least 6 weeks of this style of training, it's time to move into Sports Specific Hypertrophy (SSH).
In SSH, there is still a focus on fast movement. Protocols will largely resemble max strength training (which, at your age, and with your limited experience, you should not be venturing into - Max Strength is for trainees who've been at it for over a year), however at a lighter load. You want to do 2-4 sets per exercise, on top of at least 1 warm up set. You want to do every rep hard and fast, remembering the 2:0:1 tempo you've built up to in AA. And you want to do each working set to fatigue, then rest 3 minutes and do it again. You'll need the 3 min rest to allow full recovery of both ATP (energy) and your neurons. This type of hypertrophy training focuses on fast-twitch muscle fibres, being activated in a fast way. You want to start out doing sets of 12 reps, then, over the weeks (or even months) build up intensity until you can only do 8 reps per set. An SSH program might look like this:
Sessions/Week: 3
Sets: 3
Reps: 12
Rest: 3 min
Tempo: 2:0:1
- Deadlifts
- Bench Press
- Squats
- Chin Ups
- Military Press
- Bent Over Row
Conversely, you may elect to do an A/B split, such as:
Day 1 (A):
- Squats
- Bench Press
- Bent Over Row
Day 2 (B):
- Deadlifts
- Military Press
- Chin Ups
I suggest that you do SSH for 6 weeks at 12 reps, then do 6 weeks at 10 reps. On the first of these second 6 weeks, stop 2 reps short of fatigue, and only do 2 sets/exercise. This becomes your deload week, which you'll need to help prevent overtraining. During this second SSH stage, do a fourth set of squats, taking away all weight but the bar itself, and perform jumping squats for this final set. This is a power set, and you are aiming to jump as high as possible with every rep. As soon as you lose height, finish the set. This set is not to the point of fatigue. Also during this time, do a fourth set of deadlifts, once again stripping the bar of all excess load, and perform a power shrug (that is, a high velocity deadlift with a shrug in the top position). Again, complete to speed fatigue, not to muscular fatigue.
Do one more 6 week period of SSH, this time doign 8 reps per set. Once again, deload in the first week. This time, instead of jumping squats and power shrugs, you'll do a power clean after every set of squats or deadlifts. And this final 6 week phase should bring you up to 6 months of training for strength and mass without substituting speed. Whether or not you'll gain the full 25 lb is dependent on many things (doing the exercises correctly, having a caloric surplus of 500kcal/day, consuming 1.2-2g protein per kg body weight/day, sleeping 8 hours a day, and the one uncontrollable factor: genetics). But it's a realistic goal that may be achievable, and meanwhile you'll be doing training that should benefit your running rather than hinder it.