I DID it! Clipless revisited

[Catrin]

Ok, odd question. Do clipless pedals use additional muscles than platforms? It just seems to me that since they allow us to use the entire stroke rather than just the down part - that this would make sense.

Any chance this can cause soreness at first? Am considering clipping in for the first 30 or so flattish miles tomorrow (outside of 3 hills), then changing to my trusty Keene Commuters and the platforms for the remaining hilly....(well, less flat with some quite steep yet short hills) 45 miles.

I want a little more practice clipping in on hills before committing to 45 miles of them, but I really want to try them on the rural flat roads tomorrow. Does this seem a bit much for my second time going clipless? Trying to push myself without overdoing it...