My 5 mile series is coming to an end now.
Running since August I've managed to set my PB's;
5km - 21m11s
5miles - 34m55s
10km - 47m - could easily drop this to sub 45 but not run it yet.
Half Marathon - 1hr 44mins
I have one 5 mile run left. I want to beat my 34.55 time.
What's the best way to drop this time down? I have a month!
Park-runs - ie races increase your 5km speed to bring up your average speed on 5 miles
interval training - do say 10k with 700m flat-out (for that distance), and 300m jog to rest, repeat etc
join a club

my running has improved no-end after joining a club
Tuesdays are always effort sessions; long efforts, long and short efforts, fartleks, or hill-sessions
Thursdays - 5 mile tempo run
the Park-runs if you have one local are great - to do a free race almost any Saturday you wish - its improved my PB for 5km down to 20'15. The 5ks have improved my average pace then on 5 mile runs etc