TB Hill Interval

Legs still abit achy today.. manage to complete 5 sets.. din do as well as the last rd.. felt the tiredness n hard to push forward tho i felt i put in more effort today.. maybe increase pace too fast for 2nd set.. "?

1st set: 5:28:00
2nd set: 5:14:55
3rd set: 5:17:32
4th set: 5:17:65
5th set: 5:20:42