I think every woods has a 'stairs of death' by law, mine is a short but steep afair, 90 degree turn into at the top with a bridge immediately at the bottom, get your line wrong and get wet!
But what got me buzzing was a)taking the rigid out around the trails I used to ride and b)finding that riding to work has already improved the fitness, theres a nice loop that I do, last summer I'd be struggling after the second one but on saturday I managed 4 and only left because i thought I'd had a major mechanical, but turned out to be 1 loose 4mm hex bolt 😡