Push ups?

Since we're talking about the 1650 it's not really sprinting, so you could still get a lot of benefit from doing USRPT if you want to go that route. With that training you could probably keep the yardage you're doing now. You certainly would not need to do more than 3,000 yards per workout. And if you do USRPT you can't worry about total yardage. Just be concerned you are doing those sets correctly. If you want to do more traditional, longer aerobic training I would suggest that on the majority of your training days you get in at least one set where you are swimming for a minimum of 20 minutes and preferably 30 minutes without a lot of rest. Not straight swimming for 40 minutes, but a set where you're not getting much rest between swims. You'll still want to do some sets where you're maintaining your goal 1650 pace, but you don't need to do those day in and day out like USRPT advocates. If you can swim six days per week and average 3,000 yards per workout you'll be over 500 miles for the year. I shouldn't have brought up the topic of sprinting in my post, because that issue is separate from training for the 1650. (I was just adding some background info. to explain why I am focusing on the 1650 right now rather than training for sprint events.) High intensity anything is still out for me at this point. My current training program has included what I have designated as "Free Fridays." On Fridays, I do 16x100 as part of my workout. I used to be able to do them on 1:45 and hold in the high 1:20's - low 1:30's; however, that was back in the good ol' days of a healthy hip. Now I am doing that set on 1:55 and holding 1:41-2's. Thanks for your advice, Kirk!

Since we're talking about the 1650 it's not really sprinting, so you could still get a lot of benefit from doing USRPT if you want to go that route. With that training you could probably keep the yardage you're doing now. You certainly would not need to do more than 3,000 yards per workout. And if you do USRPT you can't worry about total yardage. Just be concerned you are doing those sets correctly. If you want to do more traditional, longer aerobic training I would suggest that on the majority of your training days you get in at least one set where you are swimming for a minimum of 20 minutes and preferably 30 minutes without a lot of rest. Not straight swimming for 40 minutes, but a set where you're not getting much rest between swims. You'll still want to do some sets where you're maintaining your goal 1650 pace, but you don't need to do those day in and day out like USRPT advocates. If you can swim six days per week and average 3,000 yards per workout you'll be over 500 miles for the year. I shouldn't have brought up the topic of sprinting in my post, because that issue is separate from training for the 1650. (I was just adding some background info. to explain why I am focusing on the 1650 right now rather than training for sprint events.) High intensity anything is still out for me at this point. My current training program has included what I have designated as "Free Fridays." On Fridays, I do 16x100 as part of my workout. I used to be able to do them on 1:45 and hold in the high 1:20's - low 1:30's; however, that was back in the good ol' days of a healthy hip. Now I am doing that set on 1:55 and holding 1:41-2's. Thanks for your advice, Kirk!