Yes, the normal allowance is two pieces, total weight 20 kg (44 lbs). That’s per person.
If you have a waiver, then then the limit is increased. In my case, I have a waiver for an additional 20 kg. They normally ask for it to be packed separately, but no one has specifically asked about that at check in. Then again, five bags is more than I want to handle anyway. We usually end up with three bags (one for me, one for my wife and one for the school supplies).
(1) One bag can be over 20 kg and the other one under, so long as the total doesn’t exceed 40 kg. BUT, and this is a big one, the heavy bag cannot exceed 28 kg (62 lbs) or they can refuse to carry it.
(2) The waiver is only good for the trip down. You have to make allowance for the weight of the empty suitcase making the return trip.
(3) Sporting goods are still carried free of charge within reasonable limits. These must be packed separately. Don’t be tempted to put other stuff in there because they frequently check.
(4) With the price of fuel, they are becoming increasingly stringent on the baggage weight and charge excess baggage fees regularly. That pretty well reflects how much fuel it uses to carry that weight to the destination. I’m surprised they still carry sporting goods outside your normal allowance.