Doing this exercise helped rid him of lower back pain and strengthened his posterior chain. Jefferson curls strengthen the posterior chain and may reduce chronic back pain. Physical therapist Daniel ...

Lindsey Ellefson is Lifehacker’s Features Editor. She currently covers study and productivity hacks, as well as household and digital decluttering, and oversees the freelancers on the sex and ...

Social distancing doesn't mean forgoing fitness. YouTube has compiled its top 20 fitness channels for popularity and earnings. PopSugar Fitness is the top channel with 12 million monthly views and ...