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