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Yeah, I can't imagine I'll be doing anything like VO2s outside and if I did try them I might essentially do hill repeats unless I could find a closed road like Hillingdon. Most of my stuff is SS-Threshold anyway
hippy-
Last year I did loads of their rides outside. Mostly Richmond Park, but I also did some on the roads around the Fifield TT course.
Basically intervals that are longer than about 5 minutes I hate doing inside.
In RP I mostly used the flattish bit from the Roehampton gate via Robin Hood gate and the path across the middle, with a turn of two as necessary, and an uphill finish from either end towards Richmond Gate.
That works fine as there's very little downhill I can't pedal and I can get the right gaps between efforts.
Fifield area is pretty good as flat and quiet (mostly), but I did screw up once or twice by forgetting where certain towns were (I once rode half way across slough with my brakes on trying not to lose an interval).
I've used hillingdon a bit too, more this year when RP was closed.
I've got a couple of loops round Ealing (inspiration your missus) where I hardly ever have to stop but they are a bit too hilly to work for intervals. But I'm sure other loops could be made round flatter bits of London with a bit of local knowledge. Chiswick by the river probably has potential.
frank9755
I have found their outdoor rides were useful for me as I was using a TR plan over lockdown, wanted to stick to it, but also wanted to be outdoors as soon as possible when we were allowed.
I ended up doing far longer between intervals than they suggested to allow me to get to a bit of road where I knew I could safely put down some watts for the allotted time.
Obviously, that's kind of OK for SS/base riding, but anything suprathreshold (bar the <1min stuff) was simply not feasible.