When you run – or do any high impact activity such as hopping, jumping, skipping etc – your calf muscles act like a spring to absorb the impact. If you are new to this activity, if you are modifying your running technique, or even if you are simply adding more of this to your exercise routine, you’ll probably get tight calf muscles.
To avoid strain and injury you need to stretch your calves religiously!
Most runners are familiar with the gastrocnemius and soleus stretches. If you are lazy and don’t get around to the rest then these are the ones you must do.
1. Only Running
It seems that traditionally people tack on direct core training at the end of their workouts. You see everyone in gyms perform their planks and crunches after everything else, almost like an afterthought. If they’re too buggered after lifting weights then the core training is skipped. Some people never directly train their core, and others do it at the beginning of their workout. So when is best and when is the worst time to train your core? 
First I’ll start with the most expensive option 
