AM: chilly this morning. Definitely underdressed PM: The plan was 3x1k then 5x400 to slowly adapt to more speed while still getting 5000m of work. Legs started feeling tired/heavy during the second half of the 3rd and 4th 400 so I cut the last one. Splits were 3:13, 3:09, 3:04, 71, 71, 72, 72. Cold and windy conditions so I didn't expect much. Felt better as the workout progressed until I got to the last two sets. Definitely getting stronger and adapting more every week. Calf and foot felt great during and after the workout. Zero pain or discomfort. Still did this in my trainers to be safe