Cardio Over 50?

First time post, please forgive me if this question has been discussed ad nauseum. 56 YOA, doing 5/3/1, love the program and results BUT not so much luck with the Prowler or hill sprints. Taking a toll on the joints. Any suggestions on another cardio system for my age??

[quote]bradmac wrote:
First time post, please forgive me if this question has been discussed ad nauseum. 56 YOA, doing 5/3/1, love the program and results BUT not so much luck with the Prowler or hill sprints. Taking a toll on the joints. Any suggestions on another cardio system for my age??[/quote]

Swimming, eliptical, walking, stairmaster, versaclimber, sprinting in sand, burpees, shorter hill sprints, shorter Prowler sprints, less weight on the Prowler, resistance band sprints.

Thanks!

Spinning. I forgot spinning.