I love the XPO Trainer. Recommended to me by elite powerlifter Mark Bell (check his other gear here; our podcast together here), it is effectively a “prowler” with mechanical resistance. I was initially skeptical, but it’s been one of my favorite torture tools for years now. The harder you push, the harder it pushes back, and the wheels allow me to easily use this anywhere. Perhaps counterintuitively, it is much more difficult to use on asphalt than soft or loose surfaces, which suits my urban environment perfectly. No weight plates are required. The XPO is not made in high volume, and it’s a bit expensive, so here are a few alternatives that are most suitable for grass or sand. I use the 1.0 version of the XPO Trainer, but there are newer models available. Bonus: If you want to see a walk-through of Mark’s incredible gym, here’s a video we shot together that showcases his favorite toys. If you have a push sled, a few kettlebells, a jump rope, and a weighted rucksack, you can get in exceptional shape quickly.