Swim slightly downhill
Only with a downhill aquatic line can you rotate your hips quickly
Our goal is to create light, fast-moving hips
Swim freestyle (and backstroke) slightly downhill, that is, press your head and chest deeper into the water, so your hips will be higher, so you can rotate your hips faster. With an uphill aquatic line, all you can do is push water with your arms. With a downhill aquatic line — a ½ degree is sufficient, but it must be downhill — the dynamics of swimming change, your hips become light, almost weightless, so you can rotate your hips faster and swim past the catch. Your aquatic line determines how you swim.
Put a little tension in your lower stomach so your aquatic line is straight. Swim freestyle and backstroke with a straight, slightly downhill aquatic line.
With a downhill aquatic line you will have less resistance, a firmer, more effective catch, and fast hip rotation.
It determines how you swim