LeeB

if your doing training one day and then cardio next in order to improve physical strength then NO its not good - your body needs to recover after a hard training session... cardio wont let it...

if your doing it for a specific reason i.e. sports fitness/conditioning then theres no reason you shouldnt be doing it - BUT it really should be geared toward a specific goal.

if your having problems getting in the number of calories needed then theres a few different approaches you can use...

1 - eat bigger portions
2 - change what you eat to incorporate more calorie dense foods (i.e. easier to eat)
3 - supplement with protein/carb shakes..

as youve specifically mentioned the third one ill give some info on this but please consider the other two approaches first..

theres lots of approaches to what supplements (drinks) you can use, but first you really need to give us a breakdown of what your rough daily diet is and at what times you eat/train/cardio/football etc...

the extreme range is as good as any other sports nutrition on the market (and better than most).. and i can tell you their products work as i personally use them myself! and with 25% discount you really cant go wrong!