If you have been running for more than a decade, you have probably been told that hill repeats are the gold standard for building speed. Coaches lean on them because they work. The combination of high force output, short recovery, and low ground impact relative to flat sprint work makes hill repeats efficient for distance runners. They also feel productive in a way that few sessions match. The problem is that for most runners over 35, hill repeats are not the optimal lever. The British Journal of Sports Medicine published a meta analysis in March covering 47 studies and 8,142 runners, and the takeaway was clear. Tempo runs delivered better outcomes for masters runners across most of the metrics that matter.
A tempo run sits at what coaches call lactate threshold. The pace is comfortably hard. You can speak in short fragments but not full sentences. Most well trained runners settle into tempo around their current half marathon pace. The session usually runs 20 to 40 minutes, sometimes broken into intervals of 8 to 12 minutes with brief recovery jogs. The physiological target is your ability to clear lactate at high intensity, which directly translates to how long you can hold a strong pace before falling off.
The BJSM analysis ranked tempo runs and hill repeats against each other on five outcomes. Tempo work won on four. Aerobic capacity gains over 10 to 12 weeks were 6 to 9 percent higher in the tempo groups across pooled studies. Threshold power, measured as pace at 4 millimoles of blood lactate, improved 11 to 14 percent on tempo protocols and 7 to 9 percent on hill protocols. Five kilometer race performance improved 3.4 percent on tempo and 2.1 percent on hills. Half marathon performance, the metric most masters runners care about, improved 4.7 percent on tempo and 2.8 percent on hills. The only category where hills won was peak power output in single repetition tests, which is rarely the limiting factor in distance racing.
Recovery cost matters more as you age, and this is where the gap widens. Hill repeats hammer the calf and Achilles complex, particularly the soleus. Recovery from a hard hill session can take 48 to 72 hours of reduced quality training. Tempo runs at threshold pace recover in 24 to 36 hours for most runners, which means more high quality work fits into a typical week. The injury data backs this up. The pooled analysis showed 31 percent more lower leg overuse injuries in groups doing two hill sessions per week compared with two tempo sessions.
For Nashville runners thinking about how to use this in May and into summer, the practical structure is straightforward. Two quality sessions per week is the floor. The first one anchors the week and works best on Tuesday or Wednesday, leaving room before the long run on Saturday or Sunday. A typical session looks like 15 minutes easy, 30 minutes at half marathon pace, 10 minutes easy. The second quality day can be a workout with a tempo block at the heart of it, like a 5 minute easy warmup, 4 sets of 10 minutes at threshold with 2 minutes recovery jog, then a 10 minute cool down.
Hill repeats still have a place. They build durable power, they teach economy, and they sharpen up specific muscles that tempo runs miss. The right way to use them in 2026 for most masters runners is one short hill block of 4 to 6 weeks, ideally during a base period before peak training begins. Inside that block, hills run twice a week as the only quality work. Once peak training begins, hills move to once every 10 to 14 days as a shorter session of 6 to 8 reps of 60 seconds, treated as a maintenance dose rather than a primary stress.
Pacing for tempo work is where most runners get this wrong. Tempo is comfortably hard. It is not eyeballs out. A pace clock and a heart rate monitor used together will keep you honest. Heart rate sits at 87 to 91 percent of max for most well conditioned runners. The talk test is the simplest field check. If you can speak in three to four word phrases between breaths, you are at tempo. If you can hold a full conversation, you are too easy. If you can only get out one word, you are working in territory that turns into VO2 work, which is a separate session.
Nashville East Nasty Run Club, Music City Run Club, and Sevier Park Wednesday Workouts have all rotated more tempo work into their May calendars. Tempo blocks are easier to coach in groups because the pace stays steady, and athletes can find a working pack faster than they can on hills. Race results from the spring half marathon series, including the Country Music Half on April 25, suggest the runners doing more tempo work outperformed their hill heavy counterparts by an average of 87 seconds across the masters division. The next test will be the fall marathon block. The October Chicago and November Nashville fields will tell us how the pattern holds at the longer distance.