Speed, power, and strength training generally improve endurance capacity, and adding endurance training on top of strength training is unlikely to enhance strength unless very unfit.

“if you look at any of the literature on endurance training, you will see that speed, power, and strength almost always improve endurance. Endurance training added on top of strength can be detrimental, can have a neutral effect, but generally doesn't help one get stronger by adding additional conditioning unless you're so unfit you can't get through the volume needed in the strength training.”