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To examine relationships between Brazilian Jiu Jitsu (BJJ) descriptors (belt rank, experience, gi preference, and fighting style), resistance training (RT) experience, and measures of body composition, strength (maximal handgrip, 3-5-repetition maximum [RM] in barbell glute bridge [GB], prone bench row [PBR], and bench press [BP]), and velocity (GB, PBR, and BP at 7 kg and 30–60% 1-RM), 13 experienced (4.3 ± 3.4 years) BJJ athletes were recruited for this cross-sectional, pilot study. Significant (<i>p</i> < 0.05) Kendall’s tau and Bayesian relationships were seen between belt rank and body fat percentage (τ = −0.53, BF₁₀ = 6.5), BJJ experience and body fat percentage (τ = −0.44 to −0.66, BF₁₀ = 2.6–30.8) and GB velocity (τ = −0.45 to −0.46, BF₁₀ = 2.8–3.1), RT experience and strength (τ = 0.44 to 0.73, BF₁₀ = 2.6–75.1) and velocity (τ = −0.44 to 0.47, BF₁₀ = 2.6–3.3), gi preference-training and relative PBR strength (τ = 0.70, BF₁₀ = 51.9), gi preference-competition and height and lean mass (τ = −0.57 to 0.67, BF₁₀ = 5.3–12.4) and BP velocity (τ = −0.52 to 0.67, BF₁₀ = 3.5–14.0). The relevance of body composition and performance measures to sport-specific training and research interpretation are differentially affected by a BJJ athlete’s experience (BJJ, belt rank, RT), gi preferences, and fighting style.