I do about a marathon's worth of fast walking every week as part of my commute to work and to the YMCA, where I do upper body/trunk weight training to preserve what little I have up there. Bicycling gives me the aerobic workout that walking can't. I used to jog for part of my commute, but have battled bilateral Achilles tendinitis for a couple of years. The situation is improving, so I may be able to resume some jogging, at least on softer surfaces such as the beach or a dirt trail. No concrete, and only a limited amount of asphalt.
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"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