I made a vow to be more adventurous this year, so I’m signing up for all the weird and wonderful workouts I can find in my hometown of London, then reporting back on what I’ve learned about fitness, ...

Rema Raman is a 50-year-old medical researcher with an office job, but she’s flexible enough to do the splits. At age 43, Anna Kataoka was inactive because of an injury. Now, at 48, she does ...