a client has been completing the following exercise protocol for the barbell deadlift exercise three times per week for the past six weeks:first set: 6 repetitions; 275 poundssecond set: 5 repetitions; 265 poundsthird set: 5 repetitions; 265 poundsfourth set: 4 repetitions; 250 poundshe states that for the past two sessions the last set has not challenged him. what is the most appropriate adjustment to his program to continue increasing muscular strength?