Cmon add some more 60m runs if you dont feel it 
My first week of spp was 4x6x60m 60sec/4min RI. I probably did them in like 8 sec…
Im not even going to take the stopwatch out until I work down to 1x4x60m sometime in late december. Right now Im just working on form and conditioning
Im only doing the reps over 60m on monday and saturday.
my week is:
monday 60m runs + pullups dips pushups GHR
tues sled plyos and wieghts + pullups dips pushups GHR
wed rest or tempo + pullups dips pushups GHR
thurs sled plyo+ pullups dips pushups GHR
Friday rest
sat 60m runs + cleans and + pullups dips pushups GHR
For a older guy like me more than 2x/week for 60m runs and I start to have problems recovering. Same for squats more than 1x/week and I am tired for days…