I was wondering where/how people who live in NYC train on bikes? I find it hard/next to impossible to find a long stretch of even relatively empty road to do the intervals. There is plenty of space for easy rides, but I'm yet to find space where I can do 3+ minute 'all out' intervals in relative safety for myself and people around me. I'm in Brooklyn, within 10-15min easy bike ride from Verrazano bridge bikeway and this is probably the best place I found so far; but it is still way too busy (plus bike path itself in places has these huge holes that if you hit and ended up only with a puncture, it was your lucky day) for me to even start thinking of pushing hard - I always have to be lookout for other people or the road ahead of me. Are indoor trainers is the only way to go?