Fitness drop after 1 month rest

Since back from New Zealand, I suffered from muscle pain in the Gluteal and Icheal Tuberosity, due to sitting for 10 hours on a long-haul flight.
Then I catch the flu and cough, so I rest for nearly a month.
After short riding on a home trainer for 3 days, I felt my Icheal tuberosity could withstand the hard Fi'zi:k seat.

Still not fully recovered from the cough, today I bravely ride under the hot evening sun.

The above screen captured from Endomondo shows my fitness on 25 Feb 2017
and today 25 March 2017. Today heart rate 40%  is at the maximum Zone 5.

Cycling in New Zealand - Share the road

at the winding Coromandel Peninsular  coastal road

Family of six cycling at the Coromandel Wharf coastal road

a couple walking their dog to a sailing yacht

Cyclezone Bike Shop at Fenton Street, Rotorua, New Zealand
Picture below inside the Rotorua i-Site  information center