Here's an interval that will give you strength, endurance and will add a bit of variety to your kids' training.
For this first workout you start off easy and each hill repeat gets harder. You run up the hill and jog down.
Crunches & pushups are at the bottom of the hill---on grass.
Here it is:
Find a short (400m or so) hill loop. After a 5 minute warmup, make
groups
and do hill repeats in sets of 3 or 4. Each hill repeat is followed by 10
pushups and 10 crunches.
Here is the workout......
5 minute warmup
3 hill reps with crunches & pushups
5 minute recovery jog
3 hill reps, same as above
5 minute recovery jog
add on to this as the season goes along