Info on the song:  People all over Japan exercise to this in the morning (usually about 6:00 A.M.). Children gather in a park or schoolyard, adults often join them, and many businessmen start their day off at the company this way.

Morning exercise is valuable to wake people up and give them energy for the day. The exercises, described by the leader on the broadcast, are not strenuous

here are some diferent ver of this song:

Broadcast ver

Anime Ver

Piano ver 

Song lyrics

A new morning has arrived A morning of hope. Expand your chest with joy And look at the blue sky. Together with the radio, take in a deep breath of this fragrant air. With a one, two, three.

Atarashii asa ga kita Kibou no asa ga Yorokobi ni mune wo hiroge Aozora aoge Rajio no koe ni, Sukoyakana mune wo Kono kaoru kaze ni hirakeyo Sore ichi, ni, san.

Credit

The info and broadcast ver are from http://www.ccet.ua.edu/                                        

The Piano and anime ver are from http://gantzotaku.free.fr/ost.php

The romaji transcrip are from Croik a mod from http://forum.caticus.com/