Make the marinade: combine the soy sauce, lemonade, vinegar, olive oil and honey in a small ball.
Rinse and pat dry the chicken breasts. Place the chicken in a sealable plastic bag, then pour in the marinade. Seal the bag, and toss gently to get the chicken well-coated.
Put the bag with the chicken into the refrigerator to marinade for one hour.
When you are ready to grill the chicken, preheat a grill to medium high. Spray some cooking oil onto the grill.
Take the chicken out of the fridge. Shake the excess marinade off the chicken, then place on the grill. Repeat for each of the pieces of chicken. Reserve the extra marinade.
Grill covered for 5 minutes, then turn the chicken over. Spread a teaspoon or so of the reserved marinade on each piece of chicken. Grill covered for another 5 to 6 minutes. Check for doneness, and remove from the grilled when just cooked through. This time should be good for a small to medium piece of chicken, larger breasts may need a bit more time.
We have successfully swapped in orange juice and even Gatorade for the lemonade with good results.