I walk 12-minute miles and, on a forgiving surface, can still run an 8-minute mile -- the ankles and plantar fascia give out before the heart and lungs do.
I have never been able to do 10 pullups or 50 pushups -- I plateaued a bit under half that. Physical coordination and upper body strength are two attributes in which I have always been well below average.
I can probably handle the situps.
What I have is endurance, slow-twitch muscles, and a good cardiovascular sytem. What I lack are power, speed, fast-twitch muscles, raw strength, and coordination.
__________________
"Far and away the best prize that life offers is the chance to work hard at work worth doing." --Theodore Roosevelt
Capo: 1959 Modell Campagnolo, S/N 40324; 1960 Sieger (2), S/N 42624, 42597
Carlton: 1962 Franco Suisse, S/N K7911
Peugeot: 1970 UO-8, S/N 0010468
Bianchi: 1982 Campione d'Italia, S/N 1.M9914
Schwinn: 1988 Project KOM-10, S/N F804069