How many diamond push-ups should I incorporate into my fitness regimen to achieve optimal strength and endurance gains? Are there specific variables I should consider that could influence the ideal number, such as my individual fitness level, training objectives, or recovery capacity? Might performing too few limit my progress, while an excessive volume could lead to fatigue or even injury? Additionally, are there recommended guidelines or expert opinions on the frequency and setting of these exercises? Should I vary my repetitions across different sessions to elicit greater muscle adaptation? It seems prudent to wonder, should I prioritize form over quantity to maximize the efficacy of the workout, and how might that change my approach to building upper body strength? Could it also be beneficial to intersperse these with other forms of training to maintain overall muscular balance and prevent overuse injuries? Overall, what might be the most effective strategy in determining a suitable number of repetitions?