The joke about Led Zeppelin’s name is that the band figured they’d never get off the ground. But in a way, it was prophetic: After all, what better analogy for the sound and feel of post-Beatles rock ’n’ roll than the lifting of impossibly heavy things? Covering ’70s classics through their ’90s descendants and contemporary torchbearers, here’s a set of hard and alternative rock tracks handpicked by Apple Music editors and Apple Fitness+ trainers Gregg, Kyle and Sam to push your strength workouts to the edge.