I was told by a para on my 2nd fitness assessment that I should be running with weight/ tabbing to increase my fitness at ADSC and to ready me for phase one. Recently I've been running with 12lbs in a rucksack every other day (mon,wed,thurs,sat) just doing my usual 1.5 miles, I'm going to up it to 18lbs in three more runs. After that up the distance drastically. Is there actually any benefit to this exercise? Also how much weight should I be running with? I need to get my 1.5 mile time down more than I need endurance at the moment. Last timed run with the Army was 10.20 so a minute shaved of that would be great. Selection is rolling up quickly.