Swimming 45:00 [3] 2.0 km (22:30 / km)
Easy swim with Birdy. Still working primarily on form, trying to string a quality 200 together; usually I'll get through 5 or 6 laps with good form and proper swim thoughts but then something goes awry... stop, regroup... I do feel much better though, so that's encouraging. At this point, the distance isn't a concern, just holding form.
Running intervals 25:00 [5] 3.98 mi (6:17 / mi)
shoes: Asics DS Trainer 15
4,3,2,1s: 4' @ 6:00/mi, 3' @ 5:30/mi, 2' @ 5:00/mi, 1' @ 4:48/mi (12.5 mph = max on new treadmills). 5' easy jog in between, then repeat. Couldn't finish the entire second set, so I finished it off at 6:30/mi for the final 6 minutes.
First 10 minute build averaged 5:30/mi for 10 minutes. At my running limit, once I go way above my threshold, it takes a larger toll than sustained effort; I feel like a consistent 5:30/mi for 10' would be way easier than this...