<p>In many fields—molecular biology, medicine, and chemistry—it is important to determine molecular translational mobility and the rate of the spin exchange in bimolecular collisions. This problem can be studied using spin probes and EPR (electron paramagnetic resonance) spectroscopy. Over the years, the widespread model of spin exchange in dilute solutions that is accepted by the majority of the scientific community has been challenged by a number of theoretical and experimental observations. To answer these challenges, I proposed the new paradigm of the spin exchange of paramagnetic particles and their manifestation in EPR spectroscopy of dilute solutions of paramagnetic particles in 2019. Since then, various experiments have been conducted to validate the fundamental principles of the new spin exchange paradigm. In this article, I provide further development of the new paradigm of spin exchange based on experimental confirmation of key predictions including: non-equivalent spin exchange, contribution of dipole–dipole interaction to the coherence transfer, spin polariton appearance, formation of collective modes of partial magnetizations motion, and provide a new interpretation of the effect of exchange narrowing of the spectrum at high rate of spin coherence transfer. One of the most significant results is that each collective mode gives its own resonance line, and these resonance lines in the case of relatively slow transfer of spin coherence from the interaction partner have a mixed shape. It is important to notice that the formation of collective modes of motion applies to any other spectroscopy where decoherence (relaxation) occurs as a result of stationary spectral diffusion.</p>