The other thing,
Is If you don't do the first 2 bits of self Def. well, and need to get into "fight" mode, well, it's gone wrong already, but remember to LOOK calm + confident - yes, that's hard to do, as inside, you'll be "bricking it" - just think about it. A Lion picks the weakest Zebra to eat, crims follow that mentality. Looking "Well 'Ard" may just put your wannabe attacker off, calmness confuses them, they think THEY should have the upper hand, and YOU should be scared, BUT, here, YOU are looking calmer, and more confident than the crim. gets them worried, and once you have the balance of power......RUN AWAY + RUN FAST You wil run faster than you ever imagine, the body is good at finding extra hidden "emergency" power
Always carry a phone, and a bit of cash - ( a £2 coins, not a fiver, coins hurt when they are thrown well, fivers..... don't - either can buy a bit of bus fare, even to the next stop, don't have to be all the way home. Busses have CCTV too. ) the phone is to get help with. Your keys are a good weapon if required, but you should never need to use them for that purpose, if you go to the Self. Def. course. Above all, ALWAYS have a pre-planned escape route, from anypoint on your run routes, and a "safe house" be it a chip shop/cafe/library, anywhere you KNOW is safe, and know the bus routes/times too etc. can help if you twist an ankle too, it's not all about the crims in the shadows
It's all about situational awareness - eg don't run past the pub at kicking out time, or in the dark + dingy bits.
Be careful, be confident, but enjoy your running + self def. course 