Darnell's baseball team always does warm-ups before a game before last week's game. Darnell did 50 knee lifts in 2 minutes today. He will do knee lifts for 3 minutes if he doesn't have the same rate. How many needless we'll do today
If Darnell did 50 knee lifts in 2 minutes today, his rate is 50/2 = <<50/2=25>>25 knee lifts per minute.
If he doesn't have the same rate, he will do 25 knee lifts/minute x 3 minutes = <<25*3=75>>75 knee lifts today. Answer: \boxed{75}.