So let's get creative and turn this situation into a positive. general strength them to death 3-5 days per week. they will ultimately become better athletes because of it.
when you are outside and you want bang for your buck, try a jump run-circuit. pick an exercise like jumping jacks or star jumps and perform it for 15-20 seconds, then rest for 40-45 seconds, then pick a drill like A skip and do it 4 x 15 seconds on 15 seconds off, then run intensive tempo around your circle for 1 minute, rest 2 minutes and repeat with a different jump and drill. do 3-5 different jump-drill-run combos for a session.
with the 35 m hall, set up a HJ mat as a crash pad at the end. run 15+x35 meters at 100% effort from a 3 pt start. crash into the pad and walk back and go again within 45 seconds. I bet you will produce some pretty good lactate tolerance sessions this way. if they can handle it, take 10 minutes and do it again. adjust the volume as you see fit.
Find as much variety of GS as possible. get the kids to handle their own body weight so that the girls can do real pushups and pullups!
and then send me the names of all the kids with talent!