morning coffee, green tea in afternoon.and do sprint intervals
or air alert
take it in this order. because coffee more caffeine, so
shouldn't take in afternoon or it will affect sleep.
Can take in afternoon or even evenings if you are already not
too much affected by caffeine like me 
Recently I taking Twinlab Ripped Fuel, imported myself via
iherb... cheap cheap cuz they had year end discount... Think cost
me around 35 bucks only... Then can drop off coffee for a long
time...