Whenever my wife and/or I do a protracted lay-off from training rides, we call the resulting feeling on the first few rides "Road 95". This phrase stems from around 1985 when we both stopped riding, except for errands and commuting, from mid-December to mid-February. When we realized that several centuries and double centuries we like to ride were coming up, we hopped on the bikes to get back into shape. The county we lived in was set up on a grid system with numbered roads one mile apart. We lived off of Rd. 99. When we got to Rd. 95, we both decided that was enough for the first ride and we turned around and went home. It was a pretty depressing first training ride for a double century that would occur in three short months. By the way, I finished our local double century in under eight hours that year. Your fitness will return, just get on the bike and go find it.