Sadly, having good flexibility and strength does not miraculously result in good running technique. Whilst strength training programs should be as specific as possible nothing quite prepares the body for running like running itself. If your hip stabilizers or core have been your major strength deficit then strengthening these muscle groups will help but unfortunately unless you actually use them during your run your wont be achieving the improvements as effectively as you could.
Running in Place/ Marching on the Spot Landing on the forefoot
Landing on leg and stabilizing through knee/ ankle and hip
straighten leg, push off toe, activate glut
raising up onto toe with stride action- maintain balance, pelvis stable and aligned
after foot strike focus on driving knee forward
The following is a generalized program for improving specific deficits in strength.
Firstly one needs to assess from analysis of running technique where the weaknesses may lie, then with musculo-skeletal testing of the possible causes, identify if in fact these weakness are apparent. With this information a strength program (along with a stretching regimen) is formulated for each individual. Without working through this process it would be like taking another persons medicine: sometimes counterproductive, unnecessary or conflicting with your specific needs.
Balancing Calf Raises- double leg, single Leg
Standing Lunges, Bench Lunges
Head on Ball, Single leg bridge
Wall Exercise from weight shift to single leg squat
Planks with arm raise, Side Planks
Running Motion Standing on Bosu