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.
Calves:
Balancing Calf Raises- double leg, single Leg
Quads:
Standing Lunges, Bench Lunges
Hamstrings:
Head on Ball, Single leg bridge
Gluts:
Wall Exercise from weight shift to single leg squat