Pilates (great for the core), cycling - just make sure you spin those pedals properly like a racing cyclist, instead of pushing slowly like a Sunday rider - toe clips help here - spin the wheels, instead of pushing weight - and use a gear that lets you do it - great cardiovascular exercise and good for core and legs. Rollerblading! Hiking, mountain walking, mountain biking etc. I'm sure anything that helps general fitness is broadly helpful.
SueC is time travelling.