sub 40 10 k. Please advise

[robbie_1000]

Have been keeping up with the program to date. Today was the 2k x5 R90 at 4.05.

I didn't get my rest rate after each set only the avg hr and max hr. :-(
set1 150 166
set2 155 171
set3 158 171
set4 162 175
set5 163 176

I found this easier than some of the 2k x 5 sets i've attempted before but my legs did feel heavier towards the end.

Please advise TheEd :-)

Cheers and Merry Xmas
Rob