Using Laptop to time sprints and running events

I would like to use a computer to assist in timing and keeping track of 15 soccer players that I coach. The timing accuracy need only by one tenth of a second. I'm not looking for anything fancy, just a simple method for the kids to time themselves as they practice each day.
Can anyone help me with a reference or two?
thanks

I guess I should provide more info to make the question more clear. I would like to time sprints (never more than one lap). The key would be some type of hardware accessory that would turn on the stopwatch at the 'start' and some time of switch to stop the stopwatch at the 'finish'. That way the boy/girl could time themselves. That's my goal. To allow the kids to time themselves each day at practice when they do they 40 yard sprint. I was thinking of a switch under their foot that activates when they step/lift their foot. Another alternative would be a light beam that "switches" when the beam is broken.
Any ideas?

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