Goal and background: I'm training for a 10 mile (16k) run at the end of July. My typical runs are 6k and my weekly long run is 8k. I'm trying to run 4x per week. My pace is roughly 6 mins/km — so I tend to do 5k in about 30mins. So I'm not fast, and I have a fair way to go in less than two months.
The issue: My cardio seems to be doing really well. But my overall strength isn't. When I find the right pace, I generally feel very good cardio-wise by the end of my runs (even the long 8k runs). But my legs always feel very tired, sometimes to the point of being wobbly. Cardio-wise, I think I could easily run 10-12km now, but my legs would never hold up to that.
The Question: I have 3 competing needs now: running, strength training and rest. With less that two months to race day, how can I do enough of each to be ready? At this stage should I run and rest more? Should I run less and do more strength work? I think I still need 2 rest days per week, so that only leaves 5 days for running and strength work. Should I just keep running and do as many squats as possible everyday? Should I run only hills?