I'd like to try and incorporate either Strength and Flex or something like this into my routine with running. Do I have to be near a park to be able to do the Strength and Flex? It's dark evenings and mornings and the thought of doing this in the park doesn't really appeal. Are there any other advice/ideas for me to build strength. The main thing at the moment I am focusing on is the running but a little something extra is always good.