Ran a 4:20 1600m last year off of about 30-40 MPW. My goal is 4:10 for this track season. A typical training week would have looked like this in the past.
M: 10x400m 65-66
T: 15 min tempo run 5:40 pace
W: Easy 6
T: 600m-1000m @ 2 mile
F: Easy 6
S: Easy 4-8
S: Off
Critique this plan with a new, optimized training week