dynamic stetching, warm up

Have you tried the following:
10 minutes (2-3 slow laps) with players in pairs passing the ball to each other (taking a bounce or toe-tap in-between. Then set cones up the middle of the pitch at 5m, 30m, 50m. Get the pairs to leave the balls and have them do the following up the inside of the cones whilst jogging back down the outside of the cones:
1 - Arm swings
2 - Backwards from 5m to 30m (x2)
3 - Flick legs up (heels to bums)
4 - Knees up
5 - Side skipping
6 - Open up groin by rotating leg outwards then inwards
7 - Criss-crossing (change of direction)
8 - High stepping or skipping
9 - 50% runs from 5m to 50m (x2)
10 - fast feet to 5m followed by 75% run to 50m (x2)
11 - Increase speed to 5m then quickly accelerate to 80-90%

This can be followed by some static stretching (5-6secs only) then ease into drills to build up the muscle work.

Hope this helps.

Divide your team in two - use a lane marked with two cones standing 10 meters from each other for each team. Then it is only fantasy that limits what kind of exercises your players have to do. For example:
Simple running
Above with arm swings
criscrossing
sprints
claps
etc.
After a while your team captain can do the exercise as a routine and the other players just does the same !!