Brought my heart rate up considerably higher than I have lately. Just tried to keep it higher (above 120, even into 130). Nothing fantastic. No running. But I sweated it the whole way and Lyra was happy to stretch her legs.
The good news is that I know I can maintain the faster pace for a longer period of time. The bad news is that I also know that my well of energy isn’t nearly as deep as it used to be. Got some work to do.