This indoor bike block focuses on developing your threshold — the highest intensity you can sustain while still managing lactate efficiently. Threshold sessions sit just below your maximal aerobic limit, where the work is solid, breathing is strong and steady, and concentration is essential to hold form and power. It’s not about going all-out; it’s about riding at a controlled, challenging effort you could maintain for 30–60 minutes, building strength and stamina at race-relevant intensity. Workouts in this phase will centre on sustained efforts or structured repeats at or near threshold power. You’ll use cadence control, consistent pacing, and stable power output to stay right on target — pushing hard enough to fatigue the system but maintaining smooth pedalling, good posture, and even effort across the whole session. Training at this level improves your ability to maintain strong speeds for long periods, a cornerstone for successful triathlon cycling. Over time, you’ll raise your sustainable power, ride more efficiently, and feel smoother and calmer at race pace. This block sets you up to handle longer efforts, hold steady power even on variable terrain, and finish rides with more strength — leaving you better prepared to run well off the bike and perform with confidence on race day.