Rest week is going well, just doing a few fasted Z2 rides and letting my TSB get some relief. Sleep is solid and I feel good overall. I'm definitely going to be ready to do some work on the next training block and hopefully see some good improvement in FTP. Side note, is your heart rate what trains your heart and increases stroke volume, or your watts? I did two zone 2 rides, one in the morning, and one in the afternoon heat, and there was a 30 bpm difference despite the same wattage and speed. I imagine the higher bpm (near FTP bpm, but z2 watts, and yes it was hot and humid as hell) improves my cardiovascular system more than the morning ride that was Z2 HR and watts.