Four years ago, Jenny Wiener was in a fitness slump.
She wanted to improve her physical and mental health, but her workouts lacked intensity without a proper training programme to follow.
When she went to the gym she says she often chose "easy" options, like jogging on a treadmill, to avoid more daunting exercises.
A personal trainer who might push her was out of the question because of the high cost - typically prices start from £30 an hour.
Ms Wiener, 32, who works as an events manager in St Albans, then discovered fitness app Freeletics.
