Find a block or stack a couple of 45's on the floor and sit down on a bench. Grab a dumbbell and prop it up on your leg.
Now do a "muscle round" for the sets and reps. This is how a muscle round works for stimulating muscle growth. You'll do 4 reps, then rest 10 seconds. Do 4 more reps, then rest 10 seconds. Do this a total of 5 times. Then on the 6th time around, do as many as possible. Each time you do reps think of that as a round.
For the seated dumbbell calf raises, this is simple. You do the left leg for 4 reps, then you switch to the right leg and do 4 reps. Back and forth, no rest between the mini-sets. On the 6th mini-set, crank out as many reps as possible. These are money.
If a trainer were to come to us and say he had a method of ab training that would reduce the waist size of anyone in three weeks, we'd ask him what he was selling and then kick him out the door. Luckily, Don Alessi was a fast talker and before we could introduce him to the sidewalk, he'd convinced us that he had some pretty nifty ideas.