Fixed gear is a great workout and it really helps your pedalling form. Go for it if your ride is fairly flat/rolling hills. Suggest using a smallish gear at first, 70-75 inches.
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Il faut de l'audace, encore de l'audace, toujours de l'audace
1980 3Rensho-- 1975 Raleigh Sprite 3spd
1990s Raleigh M20 MTB--2007 Windsor Hour (track)
1988 Ducati 750 F1